I've used them on a few of my fretted basses, don't feel them and stay in place, but can be removed if necessary.

Bass Collection stick on.jpg
 
  • Like
Reactions: GodPlayedBass
technically on a fretted instrument you shouldn't be pushing the string al the way down to the board and so you shouldn't feel them.

on a fretless you are pushing down to the wood and you may feel them, and i suspect they may wear away pretty quick
 
  • Like
Reactions: GodPlayedBass