If your WiFi is strong, it should not be a problem. Fidelity is the same, WiFi or Ethernet. What is different is that with weak WiFi, one can get dropouts and lost connections.
I have two streamers that have both WiFi and Ethernet, and neither one sounds different via WiFi than it does on Ethernet.
One is an Auralic Aries G1; the other a Raspberry Pi 3 with Allo DigiOne card and external WiFi dongle. The latter I would think to be similar to the iFi unit.
I don’t know if you are considering one, but I did not have good luck with a powerline Ethernet connection, tried and discarded years ago. It would not make a strong, reliable connection.
And yes, for some reason I don’t quite understand, a directly connected tablet has never produced sound for me nearly as good as either of the streamers.