Might want to black out your tag #.

If that black piece that the the plate attaches too is all plastic, you could cut a slot just wide and tall enough for the ALP bracket to go through and a hole just big enough for the connector and bolt the bracket behind the bumper area. From what I've seen in testing most people seem to go with a sensor each side of the plate (18" apart iirc) and have good results as long as you don't recess the heads. I'm sure that one of the RALETC guys will pop into your thread before too long and let you know the best location.