Follow-up for anyone who runs across this--as of right now the Digiface Ravenna does not show up correctly in Aneman. It appears in the list of devices but you can't actually patch to/from. In talking with support it's an issue being addressed between Directout and Merging Technologies, though I haven't gotten an ETA on it.
That said, doing a slower, manual-style AES67 Ravenna setup was successful and we tracked a full recording session of 64 channels at 96K last week with the RME reliability we have been so desperate for, replacing Merging Audio Device (the Ravenna software akin to DVS in Dante world). That system consisted of a Horus, 2 Hapis, and 6 Anubis connected via 5 Netgear M4250s running the AES67 profile.