Thanks for the advice! The + is the MLP (head position at the best seat on the sectional). Sadly I can't move the left side surround any closer to the fronts because of a 6' opening for barn doors. I could move the right side surround closer, but then they'd no longer be symmetrical.
The ceiling height issue is unfortunate, but I'm hoping being just 5" shy of the 8' mark won't hurt things too badly. I did some trigonometry to figure out placement that gets as close to the ideal 45 degree listening angle as possible. My wife would balk at any ceiling speaker that isn't flush, so aimable tweeters will have to do. The only real variable I can change at this point (with speaker wiring in place and drywall going in now) are speaker heights for the speakers on the listener plane.
For the fronts, I'm fairly sure I'll be putting the M5 in walls at 51" (tweeter at 47"). Surrounds would go around 50" to keep the same tweeter height.
