I don't have Spectrum, so this is all second hand.
In the past I've read you have to have at least one Spectrum box connected on your account, but you could use the Spectrum app on Rokus on other sets without an additional Spectrum box.
According to this article "you do not need a Spectrum cable box now" but it's not clear to me if they are saying you don't need the box at all, or just on the set with the Roku.
Note that Spectrum and Roku are in renewal negotiations at the moment and new Roku Spectrum app installations can not be downloaded until an agreement is reached.
Also note that we see a constant stream of complaints here about problems with the app that Spectrum supplied to Roku.
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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Streaming Stick 4K+ 3821 | Streaming Stick+ 3810 | TCL Roku TV 43S245/C107X
