Is this what my signal path should look like?

I am running a very basic set up - Roon core on my mid-2012 15" MBP running OS X 10.11.6, output via USB to Schiit MB Gungnir. Music is on an external USB drive, database on internal SSD. Yes, I know it would be better to have the music library on something other than the USB that Roon outputs to. In any case, I’m a little confused by the audio settings - I generally output to 'Speaker - Schiit USB Audio Device but don’t see the Gungnir specifically listed. Is this the way my settings and signal path should look? Things sound fine, but any suggestions for optimization on OS X would be appreciated. Thanks!

This looks just like my imac desktop setup, except I have a Cambridge Audio DAC, not Schiit. I store my collection on both USB HDD, and USB SSD. Works fine with USB drives.