I have no knowledge of HTD, Monoprice, or Dayton audio.
I'd like to give an example of a DIY system that is extremely cheap, flexible, and integrates well with Hubitat.
I'm using Logitech Media Player (ie., Squeezbox) -- not the Logitech-branded hardware-based line of network music players, but the software fork. In my case, I'm running a squeezebox server on an old laptop, and I've got 5 players -- mostly Raspberry PIs ($35) running the Max2Play distribution ($5) and connected to a variety of self-powered speakers ($25~$???, older soundbars are a good choice and easy to find used).
The system can be controlled via any web browser on my home network, or from dedicated Adroid/IOS apps. In keeping with the spirit of HE, it can be entirely local -- no Internet access is required if you've got a local content library (ie., ripped CDs).
Any combination of outputs (rooms, floors, etc) can be grouped, and content can be synchronized across devices, or each can play it's own content. Volume can be set on each device.
In addition, there's good integration between HE and Squeezebox, allowing HE to serve as a single point of control for the audio players.
The Squeezebox players can be used as voice or music outputs by HE to play audio alerts.
Well, the system I described does take some tweaking, but not programming. There are packaged solutions (ie., pre-installed Max2Play distribution, pre-configured hardware with aftermarket digital-to-analog converters, etc) that make it easier, at a low cost.
It's an option to consider, especially since the cost to try it is so low, there's little loss if it isn't what you want.
