A Rhino license is an individual license. It cannot be activated multiple times. However, if you wish to make one or more licenses available over a network for use by different workstations at different times, this can be configured using 'The Zoo'. The Zoo has a downloadable server or can be set up over the cloud.
More information on The Zoo, can be found on the McNeel Wiki site and we recommend using the cloud version but the LAN version is still available if preferred.
You would just need a Rhino account and your licence key as well as an internet connection when logging in.