Where can I extend my family visit NON-O visa in Thailand, MTT or government complex?

The original post inquires about where to extend a family visit NON-O visa in Thailand, specifically asking if it should be done at MTT or a government complex. Comments reveal that if one entered Thailand on a specific type of visa, they should go to MTT. However, the user later confirms they are at the government complex and have been told the NON-O visa extension can be processed there.