Not wall mounted, but mine are about 6" from the wall (with one in a corner), and I'm not hearing anything unusual. I think it would be worth a try.

I'd be more worried about weight. I know the mounts say they're good up to 40 lb, but when I mounted mt M22s it felt like I was at the edge of the screw/stud torque limit. I didn't use the wedge, so that would've helped.