IT'S UNANIMOUS!
Axiom's FAQ states: "
Ideally, surround speakers should be either wall-mounted or stand-mounted to either side of the couch or primary listening area, from one to six feet higher than seated listeners' ears, and slightly forward or rearwards of the listening area if you wish."
So, the height should be no problem.
The down firing woofer of the speaker may be slightly affected by the curtain beneath it, but any absorption of the driver's output that may occur should be negligible (maybe 1 or, at most, 2 dB) and, if necessary, easily corrected with the setting in your receiver. Shucks, if any absorption occurs, it may even be offset by the reflection of the top woofer's output off the ceiling. Nothing about which to be concerned.
I suspect that, due to the sloped ceiling being higher on the other side of the room and there being no curtain to affect the speaker, the output of the two surrounds will be slightly different. Again, correctible in the receiver's settings and nothing that need be of concern.
Set it all up, sit back, and enjoy.
