Your channels are added to your Roku account, so all units linked to the same Roku account get the same stations. Add or delete on one Roku, add or delete on all.
The limitation you can run into with multiple streamers can come from the channels themselves. Some may place limits on how many simultaneous streams you can have at one time.
Roku Community Streaming Expert I am not a Roku employee, only a user like you. Do not ask me support questions via private message -- post them publicly to the Community where others may benefit as well.
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Streaming Stick 4K+ 3821 | Streaming Stick+ 3810 | TCL Roku TV 43S245/C107X | Streaming Stick 3600