There's a good piece on speaker placement here:

http://www.audioholics.com/techtips/setup/loudspeakers/loudspeakerplacement01.php

It specifically adressess quadpolar surrounds, like Axoim's. None of these "rules" are set in stone, by any stretch of the imagination. They're more like guidelines.

---- A Woofer in Tweeter's Clothing... M60s, VP150, QS8s, EP350 Onkyo TX-SR702, Denon DVD-3910