Here is something that I did to my 2005 Subaru Legacy GT,..can you see it in the bumper?
I originally had it under a lip a little above the license plate area,. but when I made the cutout for my FMIC, I needed someplace else to mount it,..
This would work on a black car only though to make it concealable...
Im looking to picking one up again,..this thread makes install a little easier...