Expensive!!! Vandals spray paint over 30 cameras!

All right, you know it, I know it, landlords don't do anything, real estate's passive, you never have any projects and there's no expenses, everything should pay for itself and we offer everyone free housing, right? Well, that and this and about 20 other cameras down the row have been spray-painted. Now most of the cameras look at each other and we can see pretty much the entire campus, but there's one hidden spot where people are able to get on the roof, come over the top of the cameras and spray them. Now we know who did it, but it they didn't show up on camera, so can't really do anything. This is the second time they've done it. If anyone has a good idea on how to do this, my best idea is on top of roof, have a camera on either side. You go camera and then way down there camera and have the cameras look at each other so you can't possibly destroy them without having a whole crew of people and coordinating. Let me know your thoughts.