AllShare, Miracast, or Chromecast for use in school classroom ?

I want to wander around the classroom with a 7-8" tablet, screen mirroring internet pages and live camera video of work to the data projector. How?

Allshare - have to buy hub and samsung tab.
Miracast - have to find certified tablet and quality (but not pricey) dongle. And an old version of Android
Chromecast - I want a WiFi direct solution so that I don't have firewall issues etc...
EZCast - is this reliable? needs miracast certified device?
Windows - gulp, a windows 10 tablet with miracast maybe !

What is my best solution, and why ?
Thanks
Kevin

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