(Just so you know, this isn't true. Amiibo move-ins tend to prefer the old villager's plot, and will generally plot the new center tile within 1-2 spaces of the old home's center tile. Surrounding the move-out's house with tiles ensures that if the new villager does plot there, it will be in the EXACT spot of the previous villager rather than being off by a square or two, which helps if you want to move someone out but keep the configuration of the town the same. But it doesn't guarantee a plot there, either; the move-in could still go somewhere completely different.)