Well, currently I can’t use my Surface Pro 4 to teach. The mini-display port has gone from being intermittently a bit of a problem to “intermittently almost working”. Last Friday it became completely unusable. (I have tried with multiple adapters in multiple rooms.)
I am temporarily using my previous (Lenovo) tablet laptop, while we decide what to do. There is a Microsoft dock for the Surface 4 that might help, but it isn’t cheap! It does provide extra USB ports, though, which could be useful.