1. There is no issue with installing EEPC or MDE to systems running FRP / EEFF. This implies encryption products from 3rd parties.
2. FRP is not supported to be installed on servers, only client machines.
Just to add on to the previous comment, just like you would not want to have two anti-virus products on the same machine, the same holds good for file-level encryption products as well.
Disk encryption and file-level encryption products operate at two different levels, and can co-exist with each other.
You may find this POC guide useful, the section around "Folder encryption for HR share" in particular: https://community.mcafee.com/docs/DOC-4473