Like you, I was fighting for space and didn't have the luxury of losing a couple of feet behind an AT screen. With some compromises, I was still able to hide the speakers behind the screen while still maintaining sufficient distance between screen and front row.
I only have 10" from my screen surface to the drywall behind my screen. In that space, I managed to cram 2" of acoustic treatments, in-wall speakers (mounted on-wall to keep them proud of the acoustic treatments), and the framing for the false wall. I opted to stick the sub in the back of the room instead of building a bump out below the screen, but you could do that if you wanted.
Here is a
link showing the acoustic treatments and speakers. You could do something similar with a nice pair of Triads.
And a
link showing the false wall.
It didn't leave me a ton of room, but I even had room to put in some
speaker uplights.