If they are on the same Roku account, there should be a single billing. If you set up multiple Roku accounts (one for each Roku, for instance; that's uncommon, but nothing will stop you from doing that) then you would get a bill for each one from which you subscribed.
You can verify your subscription by going to https://my.roku.com/account/subscriptions
If you see more than one, you'll be billed more than once. If that's the case, PM @RokuDanny-R about it.
DBDukes
Roku Community Streaming Expert
Note: I am not a Roku employee.
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