I've had two home visits.
They usually ring (possibly at short notice) to say they are coming. They arrived with a laptop, scanner & printer. I had to have 2 witnesses (Pu Yai ban + 1 other). They scanned/copied the witnesses ID cards & tabbian bans. They quizzed my wife and the witnesses to establish that our marriage was legit and that I was not working. Details were entered into the laptop, printed and the witnesses signed them to say the details were true. They hardly spoke to me at all. Took 30-40 minutes.