I had many things laying around haphazardly on my nightstand and designed a customized catch-all for my most important items. Posting here because I think other people could use it too, depending on the size of your mobile devices, etc.
Dimensions for each slot are:
Print settings:
To give it some grip on the bottom, I ran a TPU print with only two layers then glued it to the PLA. So far so good!
The author marked this model as their own original creation.