Hi Tom - Currently we don’t have any doc's on the XEN systems only with the Virtual Iron from the link below on how to set this up. This was given to us by one of our customers.
For MPIO with Microsoft we have a short how to that explains that each NIC must be on a separate subnet this is all that is needed to do on our end. If you have many NIC's in the system you can bond 2 NICs to create one subnet then repeat for the other.