Try the bottom of your rear diffuser with the AMB facing the ground. Your battery is in the rear so the wiring would be very simple. Becareful to not let it touch your exhaust. I currently attach mine to my rear boomerang tow hook when on the track on take it off when off the track.
The attached picture is an old picture and I had it attached crappy . I can't find any recent pics but atleast this will give you an idea. Trust me it is attached better now.