What about QS10's? They also have the driver that fires directly into the room. While it's the larger driver and there presumably won't be much content for surrounds below the lower crossover range, it might help a bit with the back wall distance. If QS10 not in your range, then go QS8. Again, only for traditional 5.1 or 7.1. Atmos and the object oriented surround formats want direct firing speakers to work best.

FWIW, my in-laws have an all Paradigm system with ADP surrounds - I'd take my QS8 over the ADP's any day. The QS8's have an uncanny ability to be both diffuse and precise when needed. I find the ADP's somewhere in between without excelling at either.

Dan
On-Wall M5HP LCR, QS8 & EP500 in 7.1