We installed the Kohler cast iron version of this tub. It was not fastened to the floor. Actually, no cast iron tub is fastened to the floor, just hooked up to plumbing. We typically bed vinyl and fiberglass tubs in mortar. No other attachment. Hope this helps!

Thanks. We have an acrylic pedestal tub right now, but the plumber isn't comfortable with the manufacturer's instruction to use a bead of silicone caulk to hold it in place. How much mortar do you use and where? It's going on travertine over a slab base.