yep, defintely get one that can run docker, doesnt even need to be the latest and greatest, just one with a supported cpu.
i’ve got a DS2411+, which is from 2011 but can run docker, so i never have any issues with dsm and well anything any more as its all docker based so they cant screw each other up.
i’ve got sonar, radarr, sabnzbd, transmission, jackett, on mine. you could add any one of the plex/kodi/jellyfin type images if needed.
i dont use that specific nzb indexer, but the one i do use sonarr has no issues with, so unless its doing something incredibly non standard it should be ok.