I had basically the same set up in my old 5.0, when I could still carry.
Only difference is mine was mounted on the driver's side and higher up, so it wasn't really even visible when I was in the seat.
Any time I got pulled over, I just rolled down my window, put both hands on the "window sill" of my door, so they could see them and told the officers that I had a gun in the vehicle, as they were walking up.
NEVER had a problem with a single cop and most even thought it was a pretty cool idea.