I’ve been using PiVPN with Wireguard recently and before that I also tried OpenVPN. They are awesome as long as you’re using a device you can put the keys on. Like my phone or laptop.
However I’d like to connect my daughter’s apartment to our home network so she can enjoy my services - protection by PiHole, a NAS, a place her MacBook can backup data to, etc.
We have admin access to her Wi-Fi router, but like most Wi-Fi routers, you can’t put a VPN key there. Only provides place for username and password.
My only idea so far is to put an RPi Zero 2W there, that could keep up a VPN connection to the mothership. Ok but then what? The devices would still go to the default gateway, her Wi-Fi router, for everything.