I'd also recommend light pressure to avoid biting into and breaking the tile. More so if it's near the edge of one.carbide bits. They come in the anchor packages at Lowe’sI need one by each toilet also. Getting up and down on these wore out knees is rough some days. Also need one in my shower. Just in case I were to slip, there is nothing to catch me but 3 tiled walls and a glass wall. I am hessitant to DIY because I'd have to drill 6 holes in the tile and I'm a little spooked thinking about that.
Are their special drill bits for Tile or can I just use a masonry bit?
If you have a dremel, it might be handy for getting through the shiny glaze.
Luck.