I’m looking for network wide ad filtering with…

As the title says, looking for a solution to network wide ad blocking without affecting my DNS settings. I tried pihole previously and appreciate the software for being a free solution that works for a lot of people, and someone associated with the project was even willing to message back and forth with me to try to troubleshoot, but I was never able to successfully set it up. My issue is I have a Plex server that my parents access from their home, and messing with the DNS settings make that difficult. Are there any other solutions out there? Using a google fiber router, if that helps. Thanks

Found here