This Board Edge Mouniting kit is especially useful when there are no mounting holes.
Instead of gluing, taping, epoxying, etc. use these elegant standoffs. They have these round hook things that are designed to grip standard 0.062" thickness PCBs either by the edge or by the corner.
Comes in a pack of 4 with matching #6 thread forming screws. Ideal for use with up to 1/8" mounting material.