I remember experimenting with that at my old work when it was still very new. It worked, but the speeds were super slow (about 6Mbps). This was probably 7-8 years ago though, so I'm sure the technology has evolved since then (I see that one says up to 200Mbps, so it must have).
Why not just do wi-fi though? Then you don't need an adapter per network point. If the range is too far, you can get an extra wireless access point, or wireless repeater. I think most wireless access points and routers support repeater mode so that you can extend a wireless network, and they will usually have a 4 port switch built in so you can have a wired option for non wi-fi devices in the room that you put it.
