Sorry, I haven’t set up Adblock, so I’m just guessing, but does Adblock function as a proxy between you and the internet? Then you’d have to configure your browser on your desktop to hit Adblock and not go to the internet directly. If it isn’t a proxy, ignore me, I have no clue what I’m talking about. LOL.
Though as a side note, I set up PiHole in a LXC container on the Omnia and it functions beautifully for blocking advertising. If you can’t get Adproxy to work you might want to look into that.