I looked. The Denon X7200, X6200 and X5200 all have the same 9 channels amplified, and two more at "pre-out" level. This means that any of them can do 7.2.2 or 5.2.4 without an additional 2 channel power amp.
The Anthem website clearly states that the MRX1120 has "11.2 pre-amp/11 amplified channels" while the next one down, MRX720 has "11.2 pre-amp/7 amplified channels". That's why I like the MRX1120, plug & play.