Filament Shelf Storage System. The Filament Shelf file and the Stabilizer Panel models are the bulk of what is needed to build this system and both are being posted here.
@Filament_KingWhat you have there is large enough to be structurally usable. There will be a small gap, but because you are printing with a dark color it will not stand out. I do not know why you are having trouble with it falling. I can suggest cleaning your plate. Personally I use Windex wipes between prints making sure that I leave a good coat of residue each time.