Normally you would want your left/right surrounds to be to the left/right of the primary listening area. I think your 8ft. side walls would be a good choice. You can put them on stands, but I think the best choice would to have them 2-4ft above your ears. You also want to leave some room on top for the top driver to breath, I would say about 8-12inches. You might want to place them just slightly forward of the primary seats, that way the back tweeter will bounce off the back wall and give you an enveloping experience.
Good luck, and you'll love the Denon/Axiom combination...
Randy
M60's VP150 EP350 4-Qs8's
Denon 2805
Sanyo Z2 projector
