This is a 1U rack mounted holder for the newly announced Unifi Express from Ubiquiti.
Photos shows it printed with PETG for durability, this is printed as one piece.
It has cutouts in the rear for power and ethernet connections, and lots of open air gaps for cooling purposes. Just slide it in from the front and it sits snugly inside the frame.
Most importantly, I've designed this not to use any supports. Print it with the front face down on the bed. I've printed roughly a dozen of these without any issues with support.
The author marked this model as their own original creation.