Seafile cluster

Hello,

I am trying to install seafile on a three server cluster (each server with a different provider to ensure high availability). is there any up to date guide on how to do that? The manual is not very clear and the different help pages have only some information.
Any help would be greatly appreciated as I am pretty much turning in loops.

Clusting requires Seafile pro edition. The document is here: Deploy in a cluster - Seafile Admin Manual

Which part do you think not clear?