Hi Brett,
Please be informed that choosing the clone protection model depends on your requirement.
The FQDN consists of two parts: the hostname and the domain name.
However, the Computer name shown in the Diagnostics page of Admin Control Cneter is different from the FQDN of a machine.
You can find the FQDN of a machine running on domain by using the below command in Command Prompt.
echo %userDNSdomain%
Regards,
Gaurav Bhanot