I think you are going waaaaay too fast.
You should learn the theory of how to tune ignition with a dyno, how to tune ignition with EGTs, and how to tune ignition in other ways before you decide on your method of tuning.
As for that AEM unit. There is no way in hell you need WiFi capability from an EGT controller, nor do you need to spend over $200. You should be looking for something more like this:
Powertrain Control Solutions - EGT Modules
But really, you'll need to do way more research before you can decide exactly what you want to buy and how it will work with your system and if you even want to tune ignition this way.