Based on recommendations:

small : 16 cores, with at least 32 GB RAM. 2 DV instances. (small means may be 5 ~10 sources, rows into millions, YMMV)

medium : 32 cores with 64 GB RAM, 4 DV instances. (medium means may be 10 ~ 20 sources, rows into multi-millions, YMMV)

Large: custom

The defaults in the sizing applications, along with selecting 1 to 10 data sources, should result in the SMALL recommendation. It should be clear to indicate the number of instances and the size recommendation per instance.