Best way to utilize nms:recipient table for existing customer and Prospect

Hello,

The current Adobe campaign classic instance being used to target existing customer but new business plan to incorporate prospect data a well for targeting from the same instance. Capacity wise instance is good enough but not sure same nms:recipient table would be used or we should extend the nms:recipient to create customize prospect recipient table to drive the prospect targeting.

We are are going to use customize recipient table for prospect how we can ensure out of box functionality for email delivery would not be hampered for prospect.

Please confirm the best way to incorporate prospect within same Adobe campaign instance.

Thanks

Ayan B