Those are very unstable, and they don't seal very well. Bps are escape artists and could get out.
Thermometers measure heat, thermostats regulate heat. It's no different than the thermostat in your house, where you turn the heat up and down. Most people use flexwatt tape on thier racks, and it needs to be controlled with a thermostat. You can use Under tank heaters, but it would be expensive, and you can only control so many of those with one thermostat. Try here for the flex watt. He's really good at answering questions, and he can customize it for you. www.reptilebasics.com
Hope that helps.
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