It would probably mean that the camera would either have to hang down pretty low in the isles or the isles would need to be super wide so that the camera could

It would probably mean that the camera would either have to hang down pretty low in the isles or the isles would need to be super wide so that the camera could get a good view angle of the entire shelf, including bottom rows. But sure I suppose they probably could have something that rides around on a track on the ceiling and raises and lowers to get into position in each isle.