German company Balolo makes the beautifully handcrafted Setup Cockpit. There is a large and medium undertray for the Setup Cockpit that can house these 3D printed trays. Four of them will fit in the large one. I made some inserts for these as well, they are highly specific to a Dutch bankcardreader, but I am sharing them so you can modify them to your liking.
The author marked this model as their own original creation.