A:Answer These cameras require a cable connection to the DVR unit to record (in addition the cable is paired with the power supply for the camera). Therefore you would only be capable of installing in one location. For your specific question, you would need to install one system in each rental property, set up the Ethernet connection to the internet for viewing remotely for monitoring. If you do not connect the Ethernet to the internet, then you would need to be physically on site, connected to a TV, to view live or previous days activities.