Small Wall Mounted Door Guide With Roller
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This is a good door guide if you do want to, or can't make the groove, in the base of the door. It is also good for larger doors, that might need a bit more guidance to keep against the wall. Can be adjustable for up to a 55mm door.
The advantage with a door guide with wheels is you can use more than one, and they are not going to jam, as they do when the groove is in the bottom of the door.
90mm long and 35mm wide. Wheel is 34mm in diameter.
Comes with screws and a allen key for adjusting.