Also, what is the best place to have my temp probes? My AP racks have slots in them behind the heat tape, and my other rack I have taped under a "shelf", but I've heard different things about probe placement, just wondering what is optimal?
The best place I've found in my racks is secured directly to the heat tape on a slot as close to the middle of the rack as you can get. As usual, your mileage may vary so if you don't like the results you get there, try try again.