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No, it's all the same account & password . You would only need a box if it wasn't a smart TV.
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Sorry, there was a problem. Please try again later.If they are smart TVs, some have the sling app in app store. If you do not have a TV with access to applications as such It is a Roku device you will need, or a fire stick. Theres no box for sling, rather it is an app. You will need the app/ device per each tv. (Max of 3 depending on your sling package details)
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