Need one or two. I'm purchasing things at Musician's Friend to make myself feel better.
I have one "Off the Wall" hangar which I think is of significant quality and was ~$15. I'd like one that will properly accommodate 7-string necks and that I can trust to hold an expensive instrument when mounted properly.
Buy String Swing Wooden Wall Hanger for Guitar or Mandolin with Wall Bumper | Guitar Wall Hangers | Musician's Friend
I love these. They look great, are secure, and can hold anything I've thrown at them.