I'm curious if your back-up camera broadcasts to your phone or is it hard-wired to a monitor? I had one on my very 1st Speedster and thought it was a great idea, especially when I had luggage on the luggage rack, but it turned out to be pretty useless.
As I recall, I mounted my camera to the license plate light and mounted my 7" monitor underneath my stereo housing. I figured out some way of making it so I could flip it down and then back up when I didn't need it so it was out of the way.
What I didn't take into account was that we drive these cars with the top down and I quickly discovered that I couldn't see the monitor screen during the day and at night the car headlights behind me totally washed out the monitor.
I hope you have better luck.