I'm assuming you have a viper alarm system already installed?
Remove the shifter trim
and mount with a screw or double sides tape on the bare metal of the car. If you have to cut the carpet, then do so. If you don't have space then you're going to have to remove the entire center console or remove the center console cubby box and install under there. It has to be placed on a flat/leveled surface in the middle of the car in order to successfully work. Then tuck your wires and run it to wherever it's going.