Do I need a dedicated IP address if I am using SUB-DIRECTORIES with my multisite setup?

(Sorry, I haven't installed the Domain Mapping Plugin yet)

I have a multisite set up on Hostgator. My users are currently issued a sub-directory of my site.

Do I still need a dedicated IP address for this? OR is that only required for sub-domain setups?

Hostgator requires an SSL to be purchased as well.

If so, What are the setup steps for this.

Thank you for your help.