You can install a camera on the floor before the elevator entrance. Or in the elevator itself, but then you have to choose the viewing angle so that you can see the elevator space and everything outside the elevator when the doors open. You can also put cameras on the first floor of the building and in the elevator. With any of these options, you may need help from hinchong.com. For me, it was more effective to stop the camera on each floor of the building. That way, there was complete control of what was happening indoors and outdoors.