If the tanks have exactly the same type of heat pad (same size and draw the same wattage) then you can run multiples on one thermostat. Just add up the total wattage and make sure the t-stat is rated for it; you can't run 20 40-watt UTH's (20*40=800 watts) on one thermostat that's only rated for 500 watts total output.
Since you're planning on using racks anyway, get a decent t-stat that can handle a rack so you can move it when you're ready to move your BP's into their new digs.
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