Stack them sideways and get a patch panel.

perhaps some context here would help?

replace them with on box = problems solved

Why do you have 17 mini pc? What are you doing with them?

You could buy some cable track for the ethernet cables. It’s pretty cheap too! you can even turn the boxes around and practice cable routing to make it nice!

Bonus points if you get a patch panel with keystone couplers to bring small cables to each unit.