You right, currently no documentation about cluster support.
But I already installed 7 clusters of ePO 4.5 with HDLP9.
All what you need to do is install WCF on each node with installation folder on local drive (C: for example) and create "Generic Service" resource for this service.
No architectural changes between HDLP 3 and 9, so this method must works for version 3 also.
Yes - we did install in clustered environment and it works. Officially there is no documentation available.
For Evidence Multiple Collection you can use different DLP agent configuration file based on your location users.
I am planning to deploy that scenario soon at one of my customers, does that mean if I encountered some problems the McAfee HDLP support will not support because that scenario is not supported ?