I have a four bedroom two story home. The router is in a corner bedroom on the upper floor. The signal on the ground floor is much weaker than upstairs. Was wondering how to best position my extenders and what kind I should purchase. The device I need to boost signal too the most is my smart TV on the opposite side of the house one floor down.
I think the question that first needs to be answered is what kind of devices do you think have a weak siginal. Is it really wifi, or is it zwave or zigbee.
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OP says wifi so I'm going to assume he knows what that is 
I use one of these dirt cheap repeaters. It's working fine so far to help my wretchedly temperamental Sonos speakers to work on the terrace.
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Well and honestly the fact he calls out the Smart TV pretty much says my comment wasn't needed. Sorry dude.
This really depends on what you want to get out of it. If all you were looking for was to forward a few packets for some smarthome devices and sensors then a extender may be fine but keep in mind that they often times use the same radio to send and receive your device being extended. This means it's bandwith is halfed. So if it is only get a 300mbps connection at best your connected device can only get 150mbps.
A good mesh system with dedicated backhaul Wifi, or a Ethernet backed mest ponit is the best performance option. I would say hard wired is best, but some of these new AX systems even make that questionable unless you are running 2.5gbps Cat 6.
If i was in your position, and I have been, i would just get some good ethernet cable that can do 1gbps to from your main router to the other side of the house and connec either a mesh Point or AP to the other end near the tv. It may be a little overkill, but certain to give you the best possible performance.
Most Mesh systems also have ways for you to try out locations and test them with your remote points.
I would start by asking if there is ethernet anywhere on the ground floor?
I have two Wifi routers both hard wired. One Wifi network is for the smarthome stuff and streaming services AND as a wired router for the TIVO and TV set. The other is mainly for laptops and tablets. But you could divide a different way like by floors. Wifi routers aren't all that expensive.
I also have one of those inexpensive TP Link extender [TL-WA855RE] in the garage for outdoor things like the hot tub and propane tank monitor. They are like $18.
The Thai in there is quite funny. Literally it's "Suck Signal" 
It's "suck" as in... solar panels suck in the sunlight. So we'd probably understand it to be 'connect to signal'. But I'm still having a hard time sitting in my seat from laughing.
Is just "plug it in" so zero funny.
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You have depths I never knew existed - fancy knowing Thai!
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The beauty of living abroad in a totally different culture. I just completely love it
I suspect he knows Google Translate 
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Ah ......
Had me fooled!
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Would I need to run an ethernet cable through the carpet somehow? Is it pretty easy to hide? Also what would be a good mesh point to buy? I will need to watch a video on what a mesh point is to educate myself also.
I have coax cable lines on the ground floor but no router. I'm unsure if those lines are internet enabled as spectrum here is very "funny" about what outlets they wanted to get working in this house and how... They warned me that the more outlets I make operational on the ground floor the weaker my signal upstairs to my main router will be. So I opted for them to only get two cable coax line outlets working and have no idea if the downstairs one can support a router for internet wifi. What would be a good router to buy for this purpose? I would want something with pretty strong wifi signal downstairs to go outside to the backyard as well there is also a community playground I would like to reach when taking my kids there that is just barely out of my current range behind my backyard.
I do know Google Translate, but my wife is just down the hall and I know her better.
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There are a few ways you can do it. In the situation i was in i had access to the attic. I fished the wire I bought down one wall to the spot my router was near, and then ran the other end ran through the attic out a spot in the soffit, and then down the exterier wall to the cable run inside. I zip tied the Ethernet right to the coax to keep it as clean as possible. It is really about your tolerance for drilling holes in stuff. If you don't mind drilling holes in what.
There is another option you could look at for getting a physical connection to the remote location if it has coax there. You can use a Moca device to bridge ethernet and Coax together. Last time I looked at Moca it was just under Ethernet speeds. like the difference of 960mbps vs 1000mbps. Basically you buy two of them and they attach to the coax on either end. Then you plug ethernet from them to your devices on either side. It can be a switch a router/AP, or directly to a device. This would likely cost more then runing Ethernet, but less fuss with messing with your house though.
As far as a good mesh system. I have google wifi, and it has been great so far. It is easy to use and just works most of the time. All of my issues have been with other gear. It is just supper simple to use and setup. It combines the 2.4 and 5ghz band SSID as well so no need to worry about multiple networks.
With that said it isn't the fastest or most feature rich. Google also released the Google Nest routers that integrate google home mini's into each remote mesh point. Netgear is probably close to the fastest. I believe unify is probably more prosummer. Gryphon from what i hear from my brother may be the best to manage kinds with have parental controls. There are allot of options and just need to think about what your needs are and what you want out of it. I will say Google Wifi is just stupid simple. That is why i like it so much even though i have been using routers since the late 90's, and work in IT, it does pretty much everything that could be needed from a home router.
The thing with Spectrum is it is about signal loss over the coax. It depends on how long all the runs are and what the signal is outside your home coming in. The number of outlets is is also related to the need for spliters. Once you get over 3 outlets the signal drops off fast. There are ways around it which is why i am a little surprised at how they approached that with you
