If your Denon draws 7 amps... that's with all channels driven, right? You're not using any of those channels, so you can probably cut that waaaaaay way down. However, with such a large power draw from the Emotiva, I'd be really careful about putting it all on one strip. Most 20 amp strips I've seen are actually only rated for 16, which says to me that 15 amp strips are probably rated for 12.

I am the Doctor, and THIS... is my SPOON!