plug the amps into the power strip/wall directly... Like CV said, the 12v trigger allows your receiver/processor turn amps on as configured. I have 3 different amps. When i am listening to stereo, only 2 amps are sent a 12V trigger. However, when i am watching a movie, or cable TV all 3 amps are sent a 12V trigger.. You can configure your 12v triggers independently. By utilizing the 12v trigger your amp wont have to stay on, the Denon will turn you amp on and off remotely. The 12v trigger uses a 3.5mm headphone style male plug, if i remember correctly.. You can get inexpensive cables to utilize as trigger cables.
I hope this helps.