the receiver doesn't need to be under the TV. it can sit in a basement. the question is if you really want to have proper sound or it's only a nice to have.
> use my TV without taking a class first
this is not an issue at all. HDMI ARC handles this.
Sometimes it stops working, but a reboot of the remote fixes it. The idea that I need to reboot a remote hurts my soul a little, but at least it works. Hold the TV and Volume Down buttons until the LED on the Apple TV turns off. Wait a bit and you’ll see a notice that it disconnects. Wait a while longer and press a button (volume seems safest) and it will connect again.
There are also some settings around the remote and volume. It can be set to use HDMI, the TV’s IR, and there is a learn option. The TV I’m currently on is using the IR direct to the TV… I guess this is why it doesn’t work when I try to use the app, but I almost never use that anyway.
There's no need for a super-complicated setup for good sound.
I do audio work but they took my brothers recommendation on the home theater so I'm a bit 'you made your bed' about it haha.