Dedicated IP for Domain mapping

I guess to be able to use the domain mapping plugin in the best possible way, it is necessary to have a dedicated IP for the domain hosting the multisite, ie it is not good enough that your multisite setup lives on a server with a dedicated IP that is shared with other domains.

(I am just trying to confirm my reading of some other material, which seems to be written for people cleverer than me, as I am trying to set up my Pro Site)