Help with Rack/Helix

Hey everyone......just awhile i ago i purchased a CB-70 rack and Helix thermostat from Reptilebasics......i love it and i would like to buy another one to stack on top and hook up to my current helix.

However, i dont know how to hook up the new Rack to the old rack and thermostat, the plug (where the rack plugs into the thermostat) is already occupied by the current rack.....would i have to buy a multi outlet plug or somthing like that ? please help me, im very confused.

I know it can be done, these units can be stacked up to 4 tall and be controlled by the same thermostat so i know its possible.

Thankyou so much for any replies !

Yup a multi outlet plug strip would work.

Your helix should have three outlets for three different rack plugs to connect to it.

It does.....however, the rack has two plugs that go into the helix outlet, which only leaves me with one more space for the new rack (which will also have two plugs coming out of the rack)

Oh I see. Sorry my sweaterbox rack set up from rbi only has one plug. What set up does yours have for flex-watt.