That's exactly what top view camera is - it's not a camera mounted on the roof.
It computer generates the image from the four cameras giving "top view". It's like driving an Epsom scanner in real time

. Clever. You just have to remember the side views are distorted so the image position left and right are not as viewed. The front and rear view will see walls, grass bank etc but from experience in Croatia they don't see narrow passage way wall protectors in entrances to old carriage hotels. The car isn't a horse carriage

. Don't try it. Dented the bumper. Learnt from my mistake

. I was waved through the first time by the hotel receptionist... top view doesn't give you the same accuracy

. Bumper good as new when it was popped out. All round ultrasound, that and top view are musts to me. Former good for single track roads, lots of squealing let the other guy sort getting past out.