Multiple IP addresses accross multiple Servers

Hello,

I am trying to use WPMU as a single CMS for multiple sites that are related to each other. For SEO reasons, the sites are hosted on different servers. I know how to use the Domain Mapping plugin for multiple domains on the same server but I need guidelines for setting up multiple IPs which belong to different servers (i.e. how to setup DNS for each domain). The servers setup is CPanel/WHM.

i.e.

main site is on server 1 (one IP)
another site is on server 2 (different IP)
another site is on server 3 (yet another IP)

Can anyone help please?

Thank you.