Oh I see, I thought you were going to have a false wall and hide everything behind it for some reason. The only option they have that would possibly work would be the Triple 8HT-LP low profile speakers that can be wall mounted....lol talk about profiling, but I only suggested them to you because you have a PSA sub so I know you can appreciate a good ID brand.
JTR Noesis 228HT (LCR)
Axiom Audio QS8 surrounds
Sherbourn PA 7-350
Falcon Screens FVHD105
Dual PSA XS30's (gone but not forgotten)