Use a roku/firestick on each of them. Even if you have two rokus, you should be able to individually pair them so that one roku won't affect the other.I have 3 Samsung's in the house all from Costco too. 2 of them I wanted to have side by side on a side basement wall but I couldn't do it because the same remote would control them both no matter what I tried. So if I turned it on, both came on, wanted to change channel on one, they'd both change channel. Ended up just buying a different brand to hang next to the Samsung. Did you run into that issue with yours and have a workaround?