Here is my skadis mount for the Sonoff Zigbee 3.0 Dongle Plus.

The design utilises these dovetail hooks for the skadis system.

I then use a good quality USB extension lead to plug the dongle into my RPi4 that is running HA.

Take some care in inserting the dongle to the mount as the tolerance is tight to ensure a good hold of it, also just for reference the side that is completely open is the USB side.

Enjoy!