re: IPTV hardware

We use a combo of the recommended devices. Shield Pro and Apple TV 4k for our main TV and Onn and Tivo Stream 4K for bedrooms and other TVs.

As said by others the Nvidia Shield Pro (I'd avoid the Tube model) works great. It has been around for a while but it still holds its' own. It supports Dolby Atmos and Dolby Vision.

The Onn boxes work well, especially for the price. The memory can be expanded via OTG adapter if you wish. It doesn't support Dolby Vision.

The Apple TV is fast and has a clean interface. Its' biggest drawback is if you want to sideload apps. There is an app called Tivimax that is basically a TiviMate clone. It supports Dolby vision and Atmos and is the best at auto framerate switching.

Another budget choice is the Tivo Stream 4K. It is $25 at Amazon now. You can ignore the Tivo part or even De-Tivo it if you wish. It has a good remote. It supports Dolby Vision and Dolby Atmos. It won't do 24p Dolby Vision though.

I would try picking up a cheap ONN and Tivo Stream and seeing if they meet your needs. They are both cheap and you could return them easily if you don't like them.