When you drill a tile just turn off the hammer function on the drill and use a piece of masking tape on the spot and you can do the drilling with an ordinary concrete drill.Well I have drilled tiles a lot and what works for me is take the drill off hammer action with a bradawl tap gently and score a mark on the tile so the bit doesn’t slip.drill through the tile off hammer when you get through the tile put in on hammer action and drill into the wall.When you place the plug in the hole make sure the plug is passed the tile or you will burst the tile.