New Rack Coming

I have a three tub Iris rack coming from Animal Plastics. I am new to racks, and am wondering if I need to drill holes in the tub for ventilation? If so, where and how many?
Also, where do I put the thermostat probe when I hook it up to the rack? Sorry if these are kind of basic questions, but I am still learning!

You'll probably want to make a few holes for proper air circulation. I believe most people use a soldering iron to melt the holes instead of a drill... dull drills have a way of cracking the plastic, and a hot iron is pretty fast and fool proof.

You can start off with about a 10 holes on two sides and increase the amount depending on humidity levels.

Good luck!

Thanks, I think my hubby has a soldering iron too.