Out of curiosity, you have to open a port in the router for that to work, right? How does that work in the security aspect? Do you need to do some constant maintenance in your setup or something in order not to be vulnerable?
While you have to open a port for wireguard, it doesnt respond to anything other than your clients with a key. It should be safe enough without any maintenance, but security updates are always a good idea. If you don't want to open port there are alternatives like tailscale or zerotier, but I have never tried them
How much battery do you think this consumes? I've always thought an always on VPN set up but never tried it as I assumed it would drain the battery too quickly.
The battery consumption is negligible. I use Invisible Pro with so many different types of blocks and circumventions that it's almost ridiculous, and it runs at about a 3% in 24 hours. Invisible Pro has to be way up on the battery sucking scale for similar products.