Securing the Couch

To keep the couch from sliding around, but keeping it a little bit away from the wall so the leather won't get scuffed, I came up with these simple but effective collars cut from 1" oak with a 2-1/8" hole cut in them with a hole saw.  Theoretically the couch could jump out of these, but I don't think it will, because it's heavy enough, and 1" of vertical bump seems unlikely.  I will find out.
This seemed like a better approach that others I was considering, because the couch can easily be repositioned if I want to move it, just by lifting it out of the collars.