Can you explain how the thermostat would be set up to control 3 cages? I'm such a newbie to this stuff....sorry .....so if I use a thermostat with 2 outlets, what gets plugged into them (which heating elements get plugged into the thermostat??)....if there are 6 heating elements, how are they monitored with only 2 outlets on the thermostat? I know I'm missing the concept here...