I think I am going try those T59 insulated staples today they look safe!
On my indoor payphones I like to use my T4 Staple Gun for qaud telephone wire.

IBDN/CDT Cerified For What's Comming Next!

I prefer Beldon cat5e wire it's good quality and labeled in one meter increments, just in case you charge by the Foot ... aok
https://www.contact-directconnect.com/Micro%20Fiber%20Duct.htm