I am a Rockna dealer and have the Wavelight here on demo. No news on the Wavelight server. Wavedream Server would do the job quite well.
I have had a lot of success with the Chord 2go/2Yu streamer as a Roon Endpoint and Roon Nucleus or Nucleus+ as a server. You will connect to the 2Go via Digital Coax.
The Antipodes S40 is a good server with a nice upgrade path.
I will caution against one unit which is relatively popular. Do not get a Bricasti M5 with the Wavelight. There is an issue with clocking between the two devices and it will work fine at first but after a few months the DAC will drop the server.