I have used a STATEMENT Next-Gen going USB into a Rossini as DAC/Pre and found this quite exceptional. If possible, I do suggest trying one of the offerings further up from the ZENith Mk3 if playing into something like a Rossini.
I second Stephens above point. We actually used the ZENith Next Gen via USB just recently with a Vivaldi Apex Dac at Audio Show Deluxe in the UK with great results. It was a terrific combination!
I was using a DCS Rossini Apex Player last week for demonstrations, with a Pulsar and a ZENith Next-Gen. I have used this combination many times, and it sounds sublime!
I have used a Zenith Mk3 and Statement NG with a Rossini, great combination. I used USB and Sense, not the DCS Mosaic app. If you go on the DCS forums the feedback will favour an ethernet connection being used, I never found USB to be lacking.