This Clip-on mount is for universal antenna mount standard on top plate.
Read more info about the standard proposal here: DiA universal antenna mount
There is two ready to print files, with 3mm and 2mm holes angled in 45 degree. They both are with integrated supports for clips. They are red colored in the first picture. Just cut them off after printing.
There is also STL and STEP files of base version of this mount. So it will be easy to modify it for your need.
Use 95-98A TPU.
Print the back of the mount down. See the slicer screenshot.