I kind of have an idea of what you are trying to do. Matt had helped me with this same issue once before. I did what he had told me to do and it works great. In an "S" formation, start at the bottom (or top) and weave your way through all the shelves. One hookup. This way you get less wattage and the same effect. Also, the heat will be distributed equally and you don't need a bunch of thermostats. Place the probe in the middle of the rack and they should all be about the same. But, if you want them different all different temps (not sure why, but heh you never know) your way would be good. I use a themometer in all my tubs, just to be safe.