I just bought a 2011 GT/CS and installed mine.
I've had a Valentine One in my cars for a long time now and found the best setup for me to be a Blendmount mount which attaches to the rear view mirror bar, using 2 bolts, and an invisicord for power. The invisicord has 2 long skinny metal prongs on the ends, for 12v positive and negative, which plug directly into the power harness on the back of the mirror.
The whole setup takes about 10 minutes to install, start to finish, if you know which are your 12v positive and ground wires. There's no cutting, modifying what's there, it's just plug and play. The mount for the detector is just like normal, so you can take it down if need be, or swap it out to another car as I do, so I only need to own one, and can use it in all of my cars. It's as easy as grabbing my sunglasses to swap from one car to another. I've used this setup in about 6 different cars now, and the nice part is when you sell one car, it's easy to remove, then install on the next one.