I have the audeze mm100’s and the ath r70x, I use a behringer 2x2 interface for listening and gaming on pc. I was curious if it was a weak point. So I got the audient id14 interface that claimed to have a “better” dedicated headphone amp. I spent hours listening to both and could not notice any improvement whatsoever. My weak point is not having a ground loop isolator for the interface but that only affects the microphone. It’s on its way right now. Just my experience.

The space between the tv and the wall is prime real estate for nasty reflections, I had issues with my studio monitors and my computer monitor in a badly treated room before but the front ports of your triangles should make it not nearly as bad as rear ported speakers. Tv on the wall is definitely good advice! What’s the room look like behind the camera?