Most magnetic knife racks that are wall mounted will come with mounting holes pre drilled on the rack.
If you plan on mounting the rack on your ceramic tile back splash, Sorry, you are going to have to drill mounting holes.
You will need a special drill bit to drill through the tiles. I think they are carbide tipped.
The smallest holes will be made by drilling into the tile that is directly in front of the wall stud. That way you just use small wood screws
screwed right into the studs. The screws usually come with the knife rack.
The rack holes should be 16 inches apart, just like the studs.
If you cannot or don't want to mount the rack so it lines up with the studs, Then you are going to have to use plastic wall anchors.
That means drilling a slightly larger hole so you can push the anchor through the tile into the wall.
The only other storage option I can think of besides a knife block is a kitchen drawer knife organizer.
Norpro makes this one: Inexpensive, and should hold up to 12 knives.http://www.amazon.com/Norpro-Piece-Knif ... B00005EBGT
There are other in drawer options as well.