File auditing on a WORKGROUP server?

I'm curious. I see that there is a way to manually install the FileAudit Plus agent on a server, but I'm wondering if this would work to facilitate auditing a server that is not on the domain. We currently have a server that, for very specific and necessary reasons, cannot be added to our domain. I do, however, desperately need to perform file auditing on this server.

So, would I be able to manually install the FileAudit Plus agent on that server, and then have that server become available to me in the ADAudit Plus console (file auditing addon enabled). We are currently on a trial license, if that matters.