The height of the cameras is absolute, they will always be shown in all your floor plans. All you have to do is give them an absolute height, regardless of the level you want to see.
For example, if you want to show something in the 2nd floor, add its height from the zero point (say 6 meters) and the height of the observer (say 1.70 meter).
Felipe Ribeiro Cunha
AC 26, macOS Monterey