Just a word of caution re: using a Mojo as a desktop DAC. I did exactly the same. I ran a USB to the charging port to ensure it stayed powered all the time. After several months, I tried to take it on a trip and found the battery would no longer hold a charge. I just sent it off to Chord to have the battery replaced, as it is not field replaceable. I don’t know if the battery was damaged by being constantly under charge or if this is a problem for other Mojo customers but wanted to raise it as a potential issue that you might want to research on the forums.
I also have an original Hugo which I have used for several years as desktop DAC and it works fine and I leave is plugged into power all the time. Of course, a Hugo is a little more bulky to use as a headphone amp while traveling.