This is basically what Zack mentioned in the video.
I attached the Fusion360 file so you can go nuts with it.
This upload contais a 1x3 and 1x2 Model.

Credit go to
DrDflo:
https://thangs.com/designer/DrDflo/3d-model/Engineer's%20Desk%20Organizer-37318
and Zack Freedman for the open source design of the #Gridfinity
https://thangs.com/designer/ZackFreedman

Gridfinity SD Card Holder (MicroSD Usb A and C)

Gridfinity SD Card MicroSD Usb C and A Holder

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Gridfinity SD Card Holder (MicroSD Usb A and C)