It should be fine, if all of the tubs have the same amount of heat source, and you want all tubs to be about the same temp, 1 thermostat will be fine. You will have to do some experimenting to find the proper location to secure the probe, (I usually put mine on the heat, and adjust the thermostat until I get proper temps. in the tub. You may have to have the thermostat set at 100 to get the tub where you want it) once you are satisfied, fasten it securely with tape or silicone.
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