Yes, this is possible, but not with the default installation. Let me explain:
It's perfectly possible to add recorder/tuners on two different machines, so in fact hook up two different TV Server installations to the core services of For The Record. But to make this really work you'll need to change the Core Services login credentials to an admin user that has full network access (by default they will be set to SYSTEM), since the UNC shares need to be accessible by the service.
You do this from the Control Panel's "services.msc".
You can always test your setup using the "Test Shares" button in the recorder/tuners panel. Of course also be sure to change one of the TV Server recorder/tuners from localhost to the machine name or IP address of the other machine.
Good luck!