I've tried searching for the individual pieces of this, but I cannot work out how to make it all come together.
Both me and my partner use Tailscale to use the Pi Hole outside our home, but due to the state of the UK, we're using Surfshark, but that bypasses Pi Hole.
I have flashed the latest firmware to my ER-X that has Wireguard support, the underlying protocol used by Surfshark.
How do I set things up so we have both Pi Hole and Surfshark both inside and outside our home?
Surfshark VPN does not support “port forwarding”. We made this decision with your security in mind — while port forwarding can be useful, it also opens a potential access point in your network that could expose your devices to unauthorised connections. Protecting your privacy and security remains our top priority.