Free-standing tub

I'd like to have a free-standing tub (no feet) installed in a bathroom that we are renovating in a mountain vacation home. My contractor is concerned that water may get under the tub and grow mold under there unless he caulks around the bottom of the tub. In pictures of tubs online, I don't see caulking and I'm worried that it might ruin the "look" of the tub.
I'm open to suggestions.
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