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depending on the size of the tub, the UTH will do little to nothing for ambient temps. the heat will not spread around the tub; that's just not how they work.
for an alternative to the ZooMed UTH: look into UltraTherm UTHs by Reptile Basics. they do not get as hot as their cheaper counterparts (but still require a thermostat for regulation), and they do not have adhesive so you can move and remove them as you please using aluminum tape.
i heat my room to ~73° which keeps the tub ambient temps above 75°. i also use a small 75W ceramic bulb placed on a tile with my one stand-alone 15qt bin. this is not the best method for heating (plastic + heat isn't always great) so this should be considered temporary (my young one isn't eating consistently so i want to keep him isolated until we figure this out lol).