My opinion, it depends entirely on individual needs.
If its simple monitoring/recording for a home it can be done very economically and no need to throw money at it.
If its more elaborate and perhaps security etc for a business then of course its a different application and cost.
Gone are the days of specialist installation in many cases.
Your visa status changes when you are divorced, but not until. Once divorced, you will need to obtain a visa on another basis to remain.
Your existing bank account and history, language ability etc has no bearing on visa status.
Doesnt state anywhere he was teaching English, he was a "language teacher" could be anything. ????
Health ussues, "not feeling well" , probable heart attack in the original article.
Hope they are true to their word, as you say, to get somewhere in around 2 weeks is good news. Hope it works out and its a good positive start for you.