I might be able to experiment with positioning before I decide on a final placement. One wall will prevent me from going to far in front of MLP and the other side prevents me from going too far back. I think I have a set of wall mounts that'll allow me to move them to a few different positions. If not a can rig up a brace with a 2x4 to mount the ceiling mounts to and adjust the positioning that way. I'll make sure the top firing speaker is not impeded by the brace as to affect the sound.

LFR1100
VP180HP
EP600
M3 In Ceiling x 4
M5OW
M2 - Atmos rears
ADA1500.5
M3 Outdoor Speakers
ADA 1000.8