Summary

Useful for mounting pin terminal blocks, individually, ganged or up to 6-pin blocks.

Solder the wires then feed through and glue the block to the mount.

Glue the mount to whatever, if wanted...

[ADDED] I made a Part/Footprint for use in KiCad (Step file). Hopefully it shows up in the files list for downloading. Images of it in KiCad and on actual prototype (ignore the crude gluing and not having mated the tongue/groove dovetails... It's not for printing, just for using in KiCad).

Printed:
PLA
3 Top layers
2 Bottom layers
1 Shell
Height = 0.2mm
Density 18% @ infill = Rect/Rect