While I have found a few posts about M3, I don't see much for MY and hard wiring a radar detector from near the mirror. I won't likely do the work myself but it would be nice if I could tell the installer where to tap into 12v. I know several people in their M3 used power at their center console. I did this in my M3 as well BUT, the power was on 24/7. I was hoping to find a location where it will only be hot when the car is on. Thoughts?