Thanks. I was also wondering specifically about ones like this:
HI762 Wifi Display Dongle Adapter Miracast Dlna Airplay FOR Smartphone Tablet | eBay
and
Freelander AP20 Wifi Dongle Adapter Dlna Miracast Airplay FOR Smartphone Tablet | eBay
They all refer to 1080P streaming support, although from what I read on this forum, video streaming is choppy in general, even with more expensive brand name models.