Finally got around to properly testmount the silk poster behind the statues.
This is an older poster which seems to have diminished due to light so I will get a new one, but wanted to test the new mounting option.
Previously I just scotch taped the posters to the rear wall, but knew I wanted something sleeker and more durable for my new shelf.
One option I thought about was pinning the poster between back wall and a sheet of plexiglass, but ended up just building a frame that is just a few millimeters smaller than the width. (on height I was restricted to poster size for now.)
The frame is very light, and the Width of the frame materials makes sure it stays at a 90 degree angle. Will figure some kind of permanent locking when finalizing mounting.