gridfinity bin (size 1x2x5, 1x4x5 and 1x6x5) that can hold (hopefully all of) your euro usb power plugs. There is surprisingly a bit of a variation in diameter and distance of the plug pins - even though it's supposed to be standardized - but so far all the plugs I found fit snuggly into the holder.
The author marked this model as their own original creation.