HITRENDS multi outlet power strip Multiboard/underdesk holder.

Holder for A HITRENDS Power Strip with USB, Featuring 5 EU Sockets, 2 USB-A Ports, And 2 USB-C Ports, Flexible Cable, Individual Switch, Smart Charging (5V/3.4A).

It was made by Underware 2.0 Customizer. 

Link: https://handsonkatie.com/underware-2-0-the-made-to-measure-collection/

Link to multiboard: https://www.multiboard.io/

To connect holder to multiboard use Flush Multiconnect - generic multiboard connector.

Link: https://makerworld.com/en/models/1026736#profileId-1017464

To mount it to multiboard panel print 2x holder and 4 x Flush Multiconnect multiboard connectors.