Adguard won’t work but uBlock Origin on Librewolf or Firefox works with at least the EasyList subscription (possibly Peter Lowe’s too). You can also use either the built in tracker in Vivaldi (just go to Settings > Privacy and Security > Manage Sources) and enable EasyList/disable the Allow ads from our partners).

Vivaldi also supports MV2 uBlock Origin for now; it will say it’s not supported but Vivaldi is fighting the removal of MV2).

I’ve had a good mix of filters and haven’t gotten the adblock warning for Youtube (knock on wood). It’s been a while since configuring but I think enabling Disable pre-fetching (to prevent any connection for blocked network requests and I’m an advanced user will help out.

I have all the uBlock Filters, EasyList, AdGuard, AdGuard/uBO – URL Tracking Protection, Block Outsider Intrusion into LAN, Online Malicious URL Blocklist, Phishing URL Blocklist