i dont have one, but from my research remember whatever tank the probe is in that is set to trigger temp and humidity devices its going to trigger from there. So best to put the probe in your most stable tank or tank that you want the others to read from. If you are doing a light for each tank you can hook up a multiplug to one of the outlets on the ecozone then plug all your lights into that.
If you have any questions shoot Tony an email from Ecozone, he's very helpful