Multi-DB on Multi-cPanel Servers

Hi,

I'm a bit confused about some of the logistics of multi-DB. For example, we run cPanel for just about everything. So what if I want to extend a WP multisite installation across multiple cPanel servers.

I understand that I can specify IP addresses on different servers (in different data centers). I'm just not sure what else to do on those servers. For example:

- Do I create those databases on the extra servers under an arbitrary cPanel account? Does it matter what the domain is, or is that account just acting as a container for the databases?
- What happens if the multisite installation exceeds the quota of any cPanel account hosting it?

...etc.

Any additional guidance would be appreciated.

Thanks!