I also use a Tekonsha Prodigy. I mounted it using the connector harness supplied with the truck, and mounted it on the bottom of the dash near the door. It's out of the way but can be easily seen from driving position, and easy to reach if needed.
The plug for the connector took some searching for. It was hidden above a wiring harness.
I use a Valley Odessey Controller and made a clamping bracket out of some aluminium bar stock and
rubber feet that installs in place of the fuse block cover. It installs in about 5 min, most of the time being
spent upside down on the floor plugging in the wiring. The back piece has 1/2" tall rubber feet to clear the
rim of the opening and the front piece has flat rubber and felt to prevent marring the finish. Nice thing is
no holes in dash and it's removable, but, you'll need to remove it to get to the fuses (a screwdriver and 2 min..)
I can send pictures if you wish.