Thanks, this answers my original question. So it IS important that I know which kind of tablet I plan to buy before I setup my dashboards because it is "somewhat" device resolution dependent. Correct?
FYI - I'll mention I'm a web developer for 15 years, so I understand the stuff you're referring to 
I'm not sure how to answer that.. Yes? but also no. I guess it depends on if you are the type to move blocks around on a screen in preparation for the delivery of a tablet, then yes. In my world, I feel like we're just stacking child play blocks, not white-helmet clipboard architects so when I think of being able to have space for 6 or 7 columns, that turns into a game time decision. Add to that, normally the most important tiles are to the left, where trimming some tiles off the far right side might not be a big deal.
If you are the type to prepare, something to keep in mind is that most tablets of the same screen size generally have around the same viewport size.. keyword viewport. So you might have an iPad SuperPro Retina 8" that has 12k resolution but the viewport will still be like 1024x768 simply because it's an 8" device.
Below is the actual data used for the calibration selection and the generated responsive breakpoints. It's not magic, it just makes sure the 'appropriate' number of tiles are on the screen widthwise with equal spacing all around while being large enough to be legible, small enough to not look cartoonish.
Aw yeah my man! same same, well since around 1996 in high school. Okay then that video will make perfect sense. The 'iPhone' and 'Fire HD' text I just included in the breakpoint so it was obvious which was currently active.
I was a little later (guess I'm a bit younger!) started in around 2000 as an open source developer (for any super nerds out there I'm one of the guys who built the IRC server called UnrealIRCd as a 15 year old!)
I'll play around a bit more. The reason the font wasn't working by the way was my fault. I was trying to do something (and failed) to embed the WOFF files directly in HE. Was trying to remove the need to depend on the cloud (or even an rpi).
There is a docker in dev for this. The hope is that all of smartly can run local one day.
Yup I saw, it upset me because I was just planning to learn docker and I was going to build that for you guys as a learning experience 
I was actually trying to find a way to embed the WOFF in the HE itself.
So I’m doing some more homework. Why do I need to root my device to use fully kiosk? Their docs seem to suggest root is not required and I can turn off screen dimming and such. Maybe I’m missing something?
You don’t have to root. It’s just a better experience when you do. You can turn off things like the auto update which forces the tablet to reboot which then leaves it at a lock screen
You can also disable the lock screen.
Others like to install their own android versions. I just do the above to make the experience better.
Alright, hopefully one last question (getting close to pulling the trigger) any where to find a good list of which Fire Tablets are rootable have the ROMs you're recommending available? I'm not an Android guy at all. If we're talking about iOS jailbreaking I can talk like I know what I'm talking about, but when it comes to Android I don't know where to begin with picking it out. I'd like to get as big of a display as I'm able so the HD10 was ideal, but I don't think that's rootable? Am I wrong? What's the newest/biggest Fire tablet I can root? Anyone have a guide on how I might disable things like the lock screen as suggested? Sorry feel like a noob in this area.
If you're willing to spend a bit more money, I mounted a huge 18" Samsung Galaxy View in my wall a few years ago and it turned out great (post is on the ST community): Huge Recessed Wall Mounted Tablet - Projects & Stories - SmartThings Community
I wouldn't recommend getting a Galaxy View anymore as it hasn't been updated past Android 5.1, but if you're willing to shell out $600 you could get a Galaxy View 2. To me the extra screen real estate is worth it. We use it mainly to view our cameras and access our recipes.
If budget is a concern, then get this tablet and you won't have to worry about rooting: https://www.walmart.com/ip/onn-10-1-Tablet-Pro-32GB-Storage-3GB-RAM-Android-10-2GHz-Octa-Core-Processor-FHD-Display/435637419
Ouch, it's not so much a matter of budget so much as cost/benefit. A dashboard is not going to provide $600 worth of benefit to me. I'm looking for a dashboard in my living room to control some common devices.
Just wondering for the other one you recommended, it's pretty much the same price as the Fire Tablet (I can get a refurb for the same price), so what's the benefit of a no-name brand over Amazon? My fear with the one you recommended is now that I won't be able to easily find a mount and from what folks are saying here I do want to root it.
Another option might be a Chromebook. The touchscreen versions can fold the keyboard behind the screen. They run Android so you can install apps. A frame mounted on the wall where you could slide them in and out. A referb unit might be very inexpensive.
Also an interesting Android app.
If your only goal is to get Fully Kiosk Browser onto the Fire Tablet, it does not require new firmware on the Fire. You can side-load four customized .apk files onto the Fire that install Google Play Store and the required Google/Android APIs to run it. Once Fully is installed from Google Play, it will handle keeping the screen unlocked and on.
The gotcha right now is that Amazon just released a 2020 Fire-10 a few weeks ago. I have no idea what the status is of side-loading Google Play onto the 2020 model. Everything has been working fine running Fully 24/7 for me on the previous Fire-10 models, though.....
Thank you! So odds are if I buy a refub 10, it's going to be the 2019...
Actually, other option is I move my 2019 version from my kitchen, make that the dashboard, and replace the one in my Kitchen with a brand new 2020 model since I use that one as more of a real tablet (I like watching Netflix when I'm stuck doing the dishes)
XDA has a lot of threads on rooting, installing custom ROMs for Fire tablets of varying size and vintage. I don’t really use android either, but this has been my go-to for installing lineageOS on Fire 7 and 8 tablets a few times over the last couple years.
So from everything I've read here and elsewhere, the biggest reason to root is to prevent auto-updates? All I want is Fully Kiosk to run 24/7
Yeah I think that's one benefit of rooting, disabling the lock screen is another, and I'm not sure if it's possible to install a custom rom without root access first?
But if the primary goal is to run fully kiosk browser, that can be done with the stock fire OS and no root required, you would just need to sideload the apk that the dev made for Fire OS. onto your device.
edit: I'm not sure if everyone finds it to be that useful, but I really like having the tablet screen turn on directly to the dashboard when someone enters the room, and turn off automatically when the room is empty again. With root access, and @gavincampbell's hubitat driver for fully kiosk, that's very easy to do.
Do you need root access for his driver? Sounded like it just used the fully kiosk rest api?
Nope, just a plus license for fully (I think?) to get that rest api.
So which part of what you said requires rooting?
Download the Hubitat app
