First, you only pay for the LIVE TV subscription once, but you can use up to 5 boxes at the same time for that price.
Second, you can have one box in your living room, one in the bedroom and one in your weekend home. So, you can enjoy the whole content yourself, wherever you are.
Third, you can have one box for yourself, one for your spouse(s), and one for your kids and all of them can watch a different TV show at the same time. You just need to have "enough" internet to watch TV on multiple boxes at the same time. The rule of thumb is: 5Mbit/s (megabits per second) per box.
And finally, if you order a movie or record a TV show, all your boxes have access to it. In other words, you can start watching something in the living room and continue tomorrow morning in your study or on Sunday in your weekend home.