It seems that there may have been a misunderstanding. 
The item box contains information in both English and Spanish
On the item box, it does indeed state : Top mount/Superior and Under mount/Inferior
Those are actually the translated Spanish terms for top mount (Superior, as in mounted from the top) and under mount (Inferior, as in mounted from beneath)
If you are considering mounting the sink on a granite counter top, we recommend using an under mount, as it will be aesthetically more pleasing.

I hope this answers your question,
Thank you 
Conglom Kitchen and Bath Customer Service Team