Hi,

Point them straight out, firing across the room towards each other, except for the center rear, which should fire towards the front of the room. And the height of the side surrounds is relative to your ear level when you are seated. Depending on the surround speakers dispersion traits, I find anywhere from 18 inches to 5 feeet above ear level may work well. It's less critical with multipolar surrounds than with direct-radiating surrounds in my experience.

Regards,

Alan Lofft,
Axiom Resident Expert (Retired)