Credit to @choovick

Basically this: [https://store.ui.com/us/en/category/accessories-rack-mount/collections/rackmount-keystone-blank-insert/products/uacc-keystone-blank-insert-th](https://store.ui.com/us/en/category/accessories-rack-mount/collections/rackmount-keystone-blank-insert/products/uacc-keystone-blank-insert-th)


Update 20250726: added v2 version that might be bit stronger, did not try them thou