Sonicwall, Watchguard, Cisco, Ubiquiti - Switches and Routers

Do you have a suggestion for software and/or instructions for these devices?

I did find the Ubiquiti Router info - Ubiquiti | ZeroTier Documentation
and a Dream Machine post - unifios-utilities/zerotier-one at bc54b90f7701a4ac62d7cc300f89407d0f7bbb83 · unifi-utilities/unifios-utilities · GitHub

I was not able to find anything for Cisco switches and routers.

These are the 2 main devices I am interested in communicating with. Sonicwall and Watchguard are less important.

Just asking for suggestions before I attempt to install OpenWRT or something else.