Originally Posted by oink
Does this TP-Link require anything other than 2 modules or is some kind of streaming device also needed?
I've never used a setup like that, but it appears that it extends your hardwired Ethernet network by using the AC lines along with regular Ethernet cabling. One is plugged into an outlet near your router, connect an Ethernet cable from the router to the adapter, then go to the HT room and plug in the other adapter and then an Ethernet cable into it and then connect that cable to your streaming device or a Wi-Fi access point like I talk about below.
The streaming device that you plug into that adapter would need to have an Ethernet port, something like the Amazon stick would not work, the Amazon Fire box would work but it's over twice as expensive as the Stick. You could however, plug a wireless access point, something like this,
into the aforementioned Powerline adapter and you would have Wi-Fi capability to use the Amazon Stick. It would effectively cut down the distance the Wi-Fi signal would have to travel, have less interference from other Wi-Fi devices/routers in the neighborhood, and in theory have a much more stable and robust connection.
Something else to consider, not all streaming devices are the same, before jumping in I would do some comparison shopping of the different devices, primarily to see what their connection capabilities are and equally important, what services(Amazon, Netflix, HBO GO, etc) they have. The service selection varies by device, find the one that has all the services, or nearly all(there is no such thing as the perfect streaming device, they all have some compromise) that ones that you want before jumping in.
It might sound like I'm being too cautious, why not just get the Amazon stick and go for it? Well, trust me, it's very easy to end up with several streaming sticks and boxes before you finally find the one that works best for you.
And one last time, I really, really recommend checking into what it would take to get a hard wire into your HT, every modern HT should have a wired Ethernet connection anyway, just my opinion of course.