Hi Christian,
since Royal TS is licensed per user, it doesn't really matter if it is installed on a PC or on a Terminal Server. We know that many of our customers are using Royal TS in a Terminal Server or Citrix environment but since each environment can differ, we strongly recommend to request a trial license or use the shareware version and thoroughly test your use cases. Should you have any issues, feel free to open a support ticket.
Regards,
Stefan
Christian