I'll plug the NAS and the media source directly to the router.
Hi,
"Media Source" is a bit vague, I'm assuming it's a Meridian/Sooloos setup ... can you share with us. (A lot of us on here populate our sig. box with equipment info).
Also you don't mention what device going to run the Sooloos the Core. For Sooloos you need Core + Store + Source.
Though Sooloos will play just fine without an internet connection. A connection is only required to: update album metadata, Tidal, Radio and for software updated.
Regards,
Carl