Mount Clip for Shoe Rack Filament Storage Units

This is a mounting clip to help secure (stabilize) shoe/filament racks to the wall. I first learned about this solution on this Reddit thread. 

Here are a few of the 10 Tier shoe racks from Amazon:
https://www.amazon.com/dp/B08HZ3RGMW

https://www.amazon.com/dp/B09Q678QVP
https://www.amazon.com/dp/B09W7DSW8H

The racks are a little too narrow out of the box, but there are a few different spacer models that give a bit more room for the filament rolls. This one, by @Apitmex has worked really well for me:
https://makerworld.com/en/models/486045-spacer-for-shoe-rack-filament-storage
 

I designed this clip to better secure the rack to the back wall for stability. I printed in PETG, for strength, but it prints just fine in PLA also.

There are 4 different lengths to chose from (0mm, 5mm, 10mm, 15mm) which reflect the distance from the back of the mount to the wall when in use.

I also designed a connecting clip to help join two of the racks side by side:
https://makerworld.com/en/models/2152335-clip-to-join-two-shoe-rack-filament-storage-units