Yes the hole should be there, however, unless I am mistaken; the brackets are not. You will have to either get some brackets or have some made up for the rear subs.

As for amp location, I put mine behind the passenger seat. It's a 2 channel 1000 watt Diesal Audio amp, I actually have it bolted to the back just under where the stock subwoofer is (I have the infinity system) it actually works really well there because the passenger can come all the way back and it doesn't impede anything because it goes in the swell of the seat. Just my two cents, there are a ton of articles on here though so check those out.