I have my TRX-2 physical unit itself sitting in the pocket on the front of the center console on my F150 (no mounting, just dropped in) and the head attached to the dash over the slot for my CD player (which has not been used for a long time) -- easy, simple install that works great.
When I go places I'm not super comfortable (city, etc.), I simply pull the head off the dash and drop it inside the console (most times still turned on).