I've created that mount for a small fire-extinguisher (750ml, 76mm diameter) to be used in my workshop (in the near of my 3D printer), garage to mount a fire-extinguisher to my tool and gear wagon and in my camper van.
I've created a labeled one carrying my company name "Enginetris" and a neutral one without that. It's your choice :-). See Print Instructions for detail.
To attach the mount to a surface like a wall using 2 screws with max. 5mm diameter. The screw head should not have more than 10mm diameter.
Use the fireextinguishermount_labeled.gcode to create a version labeled with my company name "Enginetris" or start from the fireextinguishermount.3mf or the "stl" files to choose the neutral version without the company name (mountfireextinguisherconnector.stl).
The author hasn't provided the model origin yet.