I also have little trays, but this is more meant to prep for a project, so they just need to be in one place and if it was to fall, not spill. A Magnet would work, but they ain't as cheap as this.
And yes I had fun, playing with the FreeCAD Linear Patterns tool
Something like that, but with a magnet in the bottom to pull the screws off my screwdriver would be amazing.
I just swapped 24 hard drives from server trays and getting the screw off the screwdriver without having to use my other hand was the worst part of it.
The point of this was to be cheap. It's more meant to be a quick way to get the correct number of screws ready for a thing and they screws just need to be held down.