I messed around with HSW shelves for my Ubiquity Flex Mini but it was never secure. Every now and then I would see it had shifted on the shelf from the Ethernet cables shoving it around.

So I made a secure casing that'll hold it against the wall without stiff cables moving it around. In my case I'm powering it from a PoE switch, but I've made a cutout in the back for a right angled USB-C cable to be plugged into the back if so needed, while still gripping the Flex Mini securely.

Print it as it is in the STL - noting that there are two bridges that are unsupported. If you're not comfortable with your printer's bridging ability you can add supports but in most cases a correctly tuned printer will have no issue printing it without supports.