I created this step by step guide on how you active Adguard but at the same time connect to a VPN to mask your IP address.
Essentially we are going to use Adguard to make a SOCKS5 proxy connection to our VPN provider. In my demo, I used IPVanish.
You can see the guide here
I have just installed this on my 4K firestick and the HTTPS filtering is working fine. For me to install the certificate, I had to re-authenticate with my Amazon credentials but as soon as I did that, I saw the message "Certificate installed"
Actually going to make a video on it today!