Cam, I have never seen my system pull any more than 6Amps(as seen on the Belkin PF60) even when cranking it up and that included my PB13U, but you do have the RPA1 which would add a couple more amps to the draw. I think you are OK to run as much as you want through the APC, if it trips then you know you need to adjust something, most likely the RPA would need to be plugged nto it's own outlet.

Jason
M80 v2
VP160 v3
QS8 v2
PB13 Ultra
Denon 3808
Samsung 85" Q70