I am currently applying for my e-visa from Vietnam, where I am visiting. I have two questions. First, should I put my current address in Vietnam first, or my permanent residence address in my home country? Second, I am arriving in Thailand by train from Vientiane to Udon Thani. Which immigration checkpoint should I select: Fraternity Bridge 1, 2, 3, or 4?

Good morning, I'm not sure what part of Thailand I'll be in when I need to apply for an extension (I'm on a 30 day visa exemption expiring Dec 23). I found this map of all immigration offices on the official website. My question is whether the offices labeled as "checkpoints" would handle the extension, or are they border crossings where you're leaving the country and reentering (which I don't want to do)? I'm not sure what they mean by a checkpoint. The map link is here: