I have 3 systems, my first was the acoustimass 10. I wall mounted them about 7", twisted & pointed slightly downward; my rears were on the ceiling, one pointed off center & the other half pointed at the rear wall. Some people line em up straight, but that takes away from the depth. Mainly, you don't want them all pointing directly at you (the center). Also, you'll have to use your receiver's volume adjust for each one (hopefully it has a noise level feature), so you can sit and adjust each one until they match up nicely. Or are you using the active bass module? Either way, they are great speakers, and I'm sure you'll hear from some that they aren't, usually people who like to spend 5 times as much on other speakers.
All in all, I love 'em, I still get complements on real they sound, instead of just 'perfect'.
For the ultimate, I bought a pair of 901's for my fronts, and I'm still astounded at how real the sound is....
A great film to see on any though is 'Red Flag', it's an airforce film about the training excersize at nellis AFB.