I think having a good set of reverse parking sensors is good enough for most cases. I believe normally reverse cameras are fitted along with sensors. So it should be an added benefit. Another thing is to make sure that the sensors are mounted in the right place on the rear bumper. In my car, they were fitted by the dealers and are slightly higher than it should be. So it misses curbs which are lower than one foot high and the car ends up hitting such curbs, especially when visibility is bad.