As a STS, I am always trying to find a dongle free methods that don't need the wifi of the building Using Miracast seems to work well.
I am about ready to start some basic testing of a device from Diamond Mulitimedia that does Miracast among other things, including something to work with Macs and iDevices and maybe older TVs and Projectors along with HDMI. Here is a little about this device. https://www.youtube.com/watch?v=rg3RfDPKf9U
I should have results in 2 or 3 weeks to see if it works for our stake.
For my personal Windows phone, Intel Widi and Miracast convertible laptops and my Android 5.x tablet, I use a the Actiontec Screenbeam Mini 2 receiver and they work really good. (the older Android tablet, not so much with video)
I was also trying to wireless display from my phone and tablet using the built in Connect App in windows 10 and it worked pretty good.
Just some other ideas.