Temporary and Permanent residency options have to be done at the Mexican Consulate in your home country. It takes an hour appointment per person.
The numbers you gave were not the numbers from October, 2016. At that time, and it changes with the exchange rate, one person had to show about $2000 per month, a married couple, with proof of marriage, $2500. The other option was to show a worth of $183,000 each. Property could be used, and these numbers are in US dollars.
Unless you plan on spending a lot of time in Mexico, why would you want either one?
