I don't think you can assume that 6 WiFis will work. Handheld to TIU comm is totally unrelated to App to WiFi comm. I agree with Barry. We need to try it.
I was thinking about the ethernet and the only reason I would see to use the ethernet port would be if you couldn't get a good wifi signal to the wifi adapter. The app would connect to the wifi router and then the signal would go over the wire to the wifi adapter.