I don't think you need to add SMB etc - at least you didn't have to when I tried it - adding it actually caused it to give an error. But that was on a pre-release version of Roon so may have changed for release version.

Meridian owner since 1992
Prime & PSU, Focal Elear headphones, Roon (ROCK 8Gi5 NUC), Explorer 1 & 2, F80. 200/203, various Sonos (via Roon).