I installed a dual USB port next to my heated seat switch, thought I could use up some of that large empty space. It was pretty easy, I took apart one of those cigarette lighter USB deals, cut a hole into the plastic, and mounted it from behind, tapping into the cigarette lighter wires.
It could be cleaned up, I'm working up some ideas. I was going to use the plastic plate from the source of the USB's but that makes it too deep.