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Here's another place to put a proximity sensor (Omega AU-94T: looks the same as yours). It's outside the case to reduce the height. I separated the armrest (Dremeled the plastic rivets, replaced with Velcro) since I needed to adjust the sensitivities depending on where I parked. There's some electrical tape to insulate the circuitry from the two holes in the carpet.
It looks completely unchanged when it's together. If you move it from the secret compartment, you would no longer have to be a contortionist to get at the sensitivity controls. If you've ever taken the console off, you can see that the armrest part is attached to the anterior part with four plastic rivets that are melted on the ends. I used a Dremel tool and ground away just enough to slip the posterior part off the plastic posts. That's the only attachment. The forward part of the console plastic does rely somewhat on the armrest part to hold down the part near the brake release, but when you pop the rear part in (with its clips), it's held together nicely. Also, I keep a thin square of plastic 2"x2", beveled at one edge to lever up the armrest part so that I don't need to use my fingernails to pry it up against the holding force of the clips. Just something to protect the carpet (or leather).
There's plenty of space under the glove box area to run wires forward.
Do you find that you need to reset the sensitivities of proximity sensor often?
I haven't adjusted it much yet. I end up just unplugging it all the time as it's a PITA most of the time. It goes off in the rain, I even set it off walking around in my bedroom OVER the garage. (I think I actually cause the worklight hanging above the car to move, but still!) I am hoping that the more consistant weather of the summer will give me a chance to "dial-in" a decent setting for the prox. I think your location might help with my falsie problems.