I designed this for use with the IKEA Kallax shelving to keep the spines of my records even. 2 inch balsa and 3M command strips. You can choose how far back to place your records on the shelf: I mounted my brackets so the records are about 1/2 inch recessed.

This thing was made with Tinkercad. Edit it online https://www.tinkercad.com/things/4fxBwC8b7Kq