Hello benzman!
I own a Melco N1A. My principal streamer is a Bricasti M5 functioning as Roon endpoint.
Only way Melco can function as your streamer is to connect it to a DAC by USB.
Melco functions as a high quality NAS via it’s inbound ethernet connection. Melco functions as a one port switch via its outbound ethernet port, which also functions as an ethernet line purifier.
If your Bricasti M3 has a streaming board, then it can function as your streamer.
Alternatively, if not utilizing your Melco connected to your DAC via USB, you will need a network player (like a Bricasti M5 or Bluesound Node or whatever) in play ahead of your DAC. The network player could be connected to ethernet cable connected to Melco or not. Hope this helps. Feel free to PM me if you have more questions.