Here is a shelf I designed to fit all of my often used printing tools as well as all the tools I got with the Phrozen Arco and Pentashield. The shelf uses two screws from the printer chassis (circled in the last picture). The shelf can be customised as you see fit and can take plenty of weight so get creative and post up your build.

My related Arco designs:
https://www.thingiverse.com/thing:7223180 Pentashield blanking plate
https://www.thingiverse.com/thing:7224563 Storage shelf
https://www.thingiverse.com/thing:7111369 Poop catcher