If the vROps appliance needs to be hardened there is already a VMware provided guide and tool to accommodate.
“The documentation for Secure Configuration is intended to serve as a secure baseline for the deployment of vRealize Operations Manager.”
The Documentation covers the Virtual Appliance, Linux deployments and Windows deployments.
Update 6th April 2016 - https://my.vmware.com/web/vmware/details?downloadGroup=VR-HARDENING-200&productId=563
VMware vRealize Hardening Tool 2.0.0
The vRealize Hardening Tool automates the hardening activity by applying appliance-specific configuration changes to a system. For more information about hardening vRealize and on how to use the vRealize Hardening Tool