Yikes!
Lets just put a live Ethernet cable outside on the home network for “Anyone” to plug in to…
I see no possible security issues with that…LOL
My preferred method of powering the cameras is Alternate to POE method of powering cameras
Then for the WiFi coverage I use a mesh network.
Currently using an Orbi mesh system with main unit and 2 satellite units in secured locations to provide coverage to over 3 acres of my property, If I need more WiFi coverage I simply add an additional satellite unit.