I have a shelf unit (5 shelves), which I am putting 3 inch flexxwatt on each shelf (belly heat), do I need to cut and wire an extension cord for each shelf, or can I bridge the wiring to each flexwatt on each shelf using one cord, is it safe, and recommended??? I am using a helix dbs-1000 and it can only take 3 inputs, I dont want to have to hook up a supply strip with severals plugs hanging everywhere