I created some basic surface edge stoppers for a media center stand where I wanted to store some kids books.  The books would slide under the cross bar and off the stand, so I needed something to stop that from happening.  I wanted the length to be sufficient but also not use too much material, and I had two different lengths to cover.  The profile is slanted so you can either use either side to get the hold you want.  I designed this to be tough for toddler hands to detach from the surface.  Use a double sided tape to adhere to surface, I went with 3M VHB.

The Short Stop is 100mm long x 20mm wide x 11.25mm tall.

The Long Stop is 170mm long x 20mm wide x 11.25mm tall.