Belly heat all the way. The only time I will say back heat is antiquate is in a heated ball python room.
To address your concern about having belly heat in your rack. You don't need a separate thermostat for each shelf. One of the benefits to flexwatt is it heats up pretty consistently. What I have in my 2 racks is 3 strips of flexwatt soldered together in parallel 3 times in my rack. So there are 9 shelves and 3 plugs. This way if I have a problem with some flexwatt say on the 4th shelf, I don't need to take all the flexwatt off. I jut take off three. You plug all the plugs into a power bar then into your thermostat. You place your thermostat probe onto the middle or just below the middle shelf of the rack. This should give you a fairly average temps true for your rack (assuming your flexwatt is wired right). Most people will tell you their temps change from bottom to top by a few degrees. This is because heat rises. We all know that. You can run a lot of flexwatt through one thermostat assuming you don't exceed maximum wattage or use 2 different sizes of flexwatt. A 4 inch strip heats up a lot faster on the same power than a 11inch. So as long as your whole rack uses one kind of flexwatt your good! Hope this helps ya.
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