Easiest
▷ See ad blocking magic in action for yourself! Just use the ready-made Docker image and zone list (klutchell/unbound + oznu/dns-zone-blacklist).
▢ Learn from the zone redirect, and NXDOMAIN documentation to build your own custom Docker image.
◯ In which you are excited to assemble Raspi parts together, format micro SDs, install OS, and edit countless configuration files.