Yes, and this is a suggested maximum. Not the technical limit - you can have more, much more, but it would not make any sense. Even 24TB would not be used accordingly Community statistics: Current month earnings vs total earned + total held
So, we usually recommend to start small, then add more if you have it.
I can compare your stat only with one of my youngest node - 12 months old, it’s earned only $20 (including $6.78 in Held)
However it’s only 780GB
And yes, it’s with zkSync enabled.