Towel Rack Height How Do You Install A Towel Rack To Ceramic Tile??

How do you install a towel rack to ceramic tile?? - towel rack height

Ok, I had a wall tile in my bathroom. The Contractor shall not install my towel and toliet paper holder on the wall. I worry, if during any part of the pottery that could crack. (So that again) I know I can beat, so I know I have to drill the holes in the ceramic. What kind of bit and how do I use the best possible way?