R, it isn't clear what you're aiming for. You'll already have two M3s playing side surround material and located between your rear QS8 and front M60s. All the channels are already taken care of(except possibly a 7th back speaker for a 7.1 setup). Where would these extra QS8s be located and what material would be fed to them?

-----------------------------------

Enjoy the music, not the equipment.