This is a Multiboard point slide.   I use it to add point connections to tool holders.  Just cut out a 45x20x4mm section from a design and replace it with this.  It fits two of the standard Multiboard point connectors.  If you want multiple rows space them 50mm apart to fit a standard Multiboard.  This was a quick design with FreeCAD, calipers and an existing Multiboard mount.  Let me know if there is anything that could be improved.  I was able to print it flat with no supports but your mileage may vary.