No some people who don't have a rack will heat a whole room to around 84 degrees and keep the snakes in tubs without pads. Most people will have a separate heat pad for each tub and stack them together, but some tubs don't allow for stacking if the lid isn't sturdy enough.
Racks are the ideal thing to have, then have flexwatt or an UTH under each tub, or running down the back wall, which is in turn controlled by a Thermostat preferably Helix, Herpstat, or Ranco/Johnson's.
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