I use a HTPC. Using a traditional mouse is the worst. For a long time I used a Mac Mini because the Apple Bluetooth trackpad is the only external trackpad I’ve ever used that’s any good.
Then I got a Bluetooth trackball mouse. It’s by far my favorite. It’s rugged, easy to toss around, and it just lives on a couch arm.
The only steaming device I have is a Chromecast that’s exclusively used to turn on and off the TV.
Here’s the one I have:
https://www.logitech.com/en-us/products/mice/mx-ergo-wireless-trackball-mouse.html?srsltid=AfmBOoopScvacTrJlvPHKsfdFMEv0RYaScMdJHiOYTbrGTcflJoXUqek
I have another Logitech one that cost about $25.
I really, really like it. They’re really durable, easy for a kid to use, and pretty inexpensive.
Only con is if you drop it and the ball pops out, it can roll under the couch.