Your plan for a tub setup sounds excellent. They really do allow much easier cleaning and are incredibly mobile compared to tanks.
You shouldn't need more than one UTH and I would advise against that option. Ultratherms are the preferred brand and come in many different sizes. They are sold by Reptile Basics and are cheaper, cooler, and better made than other reptile brands like ZooMed.
With an Ultratherm UTH, a Hydrofarm thermostat would work fine. The reason it is sometimes discouraged, to my understanding, is because it functions on an on/off basis rather than a proportional one. Therefore, it doesn't have quite as reliable readings as a proportional thermostat would.
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