For cooling fans, you have to run a separate relay. I can't remember which ones exactly, but for some reason I'm thinking #85 Bosch style? I know there's a thread by me asking about this, because I mounted my amps under the seat, and they were cookin', put 4 fans (2 air inlet, 2 exhaust), and they stayed pretty cool after that. As for hiding them in the rear section of the interior, behind the panels. I don't know if that's such a great idea. If you were in a car accident, wouldn't you want to salvage as much as you can? Putting them there would have greater potential for them to get ruined, then say, under the seat. Most insurance companies around here do not insure the contents of the vehicle, just the vehicle itself. Then again, I've only had liability.