One could fly in the robotic can of spray with a drone, very high up (thousands of feet) so the cameras wouldn't see it, directly over the car, lower onto the roof and carefully spray the cameras without being recorded.This is vandalism, and there are 8 cameras to record the vandal.
Or the drone could climb out of road shafts if a car was parked over one and again disable the cameras.
You cannot say it is impossible, it is a real danger!