All Roku channels attach to your Roku ACCOUNT, not to a particular Roku UNIT. So all Roku units linked to a given Roku account will have the same collection of Roku channel subscriptions automatically.
You'll have to check the subscription information for each service to see how many simultaneous CONNECTIONS each will support. My Netflix and Amazon Prime subscriptions, for instance, each say they support two simultaneous connections, while my Acorn subscription says it only supports one. We have three tvs and Rokus in the house, but since we seldom have more than one or two Rokus attempting to connect to a given service at one time, this hasn't been an issue for us. (And, in fact, we've found we can view different Acorn programs on two sets at the sams time even though our Acorn account is supposed to support only one connection.) Many sevices have different tiers of service available if you need more than one or two simultaneous connections, so review your needs before you decide. You may want to subscribe to the minimum tiers first and upgrade later if you find you need more simultaneous connections. Purchasing a higher tier channel subscription would typically be cheaper than setting up separate Roku accounts for different Roku units (by using a different email address for each Roku account) and then needing to duplicate lower tiered subscriptions on each.
Roku 3, 4200X, Ser 4124C7087583, wifi connected - Samsung UN55ES6100
Roku Streaming Stick, 3600X, Ser 5S56D8240827, wifi connected - JVC EM37T
