As said, as long as the wattage is the same (actually the ratio between surface and watts) you can use power strips. EU won't allow heat tape afaik so we always use pads like that here.
Don't tape them to the tub but to the shelf underneath, it'll be very annoying when you have to wash the tub otherwise.
Also the thermostat probe needs to be taped to the heat mat, so if you set 30c that's the max temperature it'll get. Then you measure the hotspot, possibly with a temp gun, and raise the thermostat till you reach the right temp.
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