Yes, if you are not running an external amp you would need an 11 channel AVR.

I have the Axiom M3 ceiling speakers and have enjoyed them so far. There are others on this forum who think they are lacking. I've heard good things about the Paradigm ceiling speakers but I have not heard them personally.

LFR1100
VP180HP
EP600
M3 In Ceiling x 4
M5OW
M2 - Atmos rears
ADA1500.5
M3 Outdoor Speakers
ADA 1000.8