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".