Considering replacing our old toilet with a new skirted Toto. I can't drill into the floor for the rear of the adapter or side blocks. Have 1/2" ceramic tile over 1.5" gypcrete with infloor heating. The heat loop runs directly beside and behind the closet flange where the additional mounting holes would need to go so I can't drill into the floor. Anyone have suggestions on how to mount? I assume just using the closet flange is insufficient.