A:AnswerHello Fisher2022,
The Fire TV Stick will work on the television it is plugged in to, meaning one will be needed if you want to use the interface on multiple tv's. However, you can sign into the same Amazon account for each one you purchase and the interface will match on each tv you choose to plug a Fire TV Stick into!
Hope that helps!
A:AnswerIt is recommended that you have no more than 3 Fire TV Sticks installed in a single location because of signal interference between the devices. As you already have 5, a 6th wouldn't be prudent.