There are 2 possible solutions.
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Set up 2 separate Kasa accounts, 1 for each location, and integrate each location with the proper ST location. This will also fix your duplicates problem.
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If you have a ST hub the better option is to use the Kasa Edge driver for your Kasa devices. Then there is no need to link your Kasa and ST accounts. If you leave the Kasa and ST accounts linked you will get duplicates.