I have two Animal Plastics racks and love them both. Solid construction and quality units and the price is more than reasonable. I have a Helix on the quarantine rack and a Herpstat II on my collection; my choice and any future thermostats would be Herpstats. Helix works fine and is a quality unit but for the features, I prefer the Herpstats.
As to probe placement: yes, most recommendations would be to tape it to the Flexwatt and ensure as tight a seal so it reads accurately. On my 9 slot rack, I have a temperature variation of +/- 2 degrees F or so variation from the bottommost rack slot to the top (say 86 at the top rack and 83 on the bottom generally speaking); that's well within reason to me and my snakes do fine in that environment with the thermostat probe taped in the middle slot of the rack. Hope that helps and good luck with expanding your collection!
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