This is a mount for the inexpensive and common DC/DC converters available on Aliexpress and Amazon. It uses the awesome life changing Wago 221 connectors. One pair of connections for the input and 4 pairs of output connections.
Check' reihbulhl's remix for a version that works with XL6009 DC/DC converters:
The wago connectors slide in from the top and click into place. I think you could slide in 2 and 3 connector Wago where the 5 connector goes. To mount the board use a m3x4 screw and force it to self tap into the plastic. If you overdo it, a dab of cyanoacrolate glue on the back will secure the screw.
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and Wago connectors:
Note that the slots for the Wago connectors are tight. Depending upon your printers calibration you may need to scale the part by a small percentage.