Another Incubator Question

I am getting an old broken fridge to convert into an Incubator.
The fridge does seal, it is a fully enclosed design, no see through panels.

My plan is to line the back and sides with Heating Pads, and attach a fan to the top of the roof inside the fridge, circulating air from top to bottom.
My question is this: Where do I position the Thermostat Probe?
Do I need to put digital thermometers in each egg tub?

All answers will be greatly appreciated.

I have successfully bred Colubrids and other Python species in the past, but this is a whole new 'Ball' game, excuse the pun.
My philosiphy is, "Do It Right, Or Don't Do It At All".

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My plan is to line the back and sides with Heating Pads

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That's over-killed I piece of heat tape running in the back is more than enough .

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My question is this: Where do I position the Thermostat Probe?

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Because temperature will vary from top to bottom and because there will be a difference between the temp in the incubator itself and the temp in the tub, I recommend to set a dummy tub (set like a real egg tub without the eggs). Remember egg temps will rise toward the end of incubation so it is best not to put a probe in a real tub with eggs.

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Do I need to put digital thermometers in each egg tub?

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I recommend top, middle and bottom.

http://i63.tinypic.com/2nhj6ed.jpg

Thank You Deborah

This may sound stupid, where do you suggest I position the dummy egg box, would the middle be best, with the thermostat probe in the dummy egg box.