how to deploy fireeye agent using gpo

You can use Powershell to look at installations on computers if you need to verify installations.  The Scripting Guys have a better article on it than I could post here but the snippet is below and you can filter to the fireeye:

Invoke-Command -cn computer1,computer2 -ScriptBlock {Get-ItemProperty HKLM:\Software\Microsoft\Windows\CurrentVersion\Uninstall\* | select DisplayName, Publisher, InstallDate }

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Looking at the product though, is there not some centralized management console which can push the installations?

I believe fireeye have an agent deployment process.
check their documentation.