Here's the room(s) with the pending setup.
I would be tempted to put the mains closer to the TV, ie inside the windows rather than outside. That would also make it easier to position them far enough out that the front edge of the speaker is not behind the front edge of the cabinet/bench below.
Two main reasons for suggesting this:
- putting the M5's in the corners means they are going to be >20 feet apart at a 10-12 foot listening distance... definitely too wide for a stereo rig but maybe the center channel would fill the "hole", not sure
- M5HP's have a small bass bump - adding more reinforcement from corner location might make the room hard to tune... I would keep those corners free for your hypothetical future bass traps
EDIT - now I get it... the black circles are the ceiling mounted M3's, right ? Nice...
