Yep, the base is where I put it. On this specific case, the base is easier to install it to. Otherwise, I would have had to remove a chassis fan to get to it easier. Plus, I like it on the bottom more anyway.
This case is amazing though, especially since I got it for $129, and its normally $179, plus I got free shipping (Newegg). Since its mostly steel, its heavy (almost 30 lbs for the case with nothing in it). It did come with wheels though, so I mounted the wheels on it, and now I can very easily slide my PC to move it when I need to. Also, I saw a MASSIVE decrease in hardware temps after getting this setup. My Core i7 920 is running at 22 C on air cooling.