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As long as you have stud backing behind the tile to drive screws into no biggy. I'd use a carbide scribe to cut through the top layer of the tile and drill with about anything. Do no use a hammer drill function btw. The tile would probably eventually crack no matter if you drill through it or not. Up at the rod it's out of the water zone anyway so who cares. If contractor is that worried just have half a box saved or so for a later date if it doesn't work out
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