bigb

Flauncher is a great pick too

I use the ONN 4K Pro and the ProjectIvy launcher. You can completely hide the standard Android TV OS launcher and its ads. Button Mapper is another good app to have on Android boxes. The remote is full of app-specific buttons that I’ve either disabled or remapped to alternative apps

https://play.google.com/store/apps/details?id=com.spocky.projengmenu

https://play.google.com/store/apps/details?id=flar2.homebutton

I have no idea which codecs are supported.