I own the Apollo Arrow which is the model most similar to the Solo. They no longer make the Arrow and replaced it with the Solo.
I completely love my Apollo Arrow interface. It’s the best interface I’ve owned in 20+ years.
It’s Thunderbolt, mac only, and powered by the port.
On a mac USB-C can be plugged into a Thunderbolt 3 port but USB-C IS NOT Thunderbolt 3.