Yes, it is reported you can have up to 20 Rokus linked to a single Roku account. Your channel apps are linked to your account, not to your individual Roku units, so all Rokus linked to the same Roku account receive the same channels. Add/remove on one, add/remove on all.
Roku Community Streaming Expert
I am not a Roku employee, only a user like you. Please, no support questions via private message -- post them publicly to the Community where others may benefit as well.
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Ultra 4800 | Streaming Stick 4K+ 3821 | TCL Roku TV 43S245/C107X