We are happy to announce new system logic. Sub-account is no longer needed to save your trouble. You can follow the normal Roku linking process to associate additional device(s), or just let us know the Roku serial number. We will create the association for you.
The policy still stands - As subscriber, you can have as many devices as you wish in the same house.
The policy is same as cable TV - you will need to use the devices at the same household.
Due the nature of Internet, when you have multiple viewing sessions concurrently, the signal quality might be degraded, even produce lagging and unwatchable -- therefore we advise you not to use more than one viewing session at the same time.