1x5 wall mounted #Gridfinity baseplate. Sized with a 3mm hole for screws.
Typically over engineered, but will take a lot more abuse than the one piece (flange on top) designs.
Print the brackets back down, no support.
I recommend tree supports in the dovetail sockets and print the base bottom down. The supports popped clean away and no adjustment was needed to insert the brackets. They did require some percussive persuasion to seat fully.
The author remixed this model.