Yeah, I have no idea
how it works, but it absolutely does! Unfortunately trees, flowers, etc are still (un)fair game for villager houses, but so long as there's no 3x3 space available for their house to fit, they won't move there. In a recently reset town I put patterns down all over the place and left only 3x3 spaces where I wanted my villagers to live. You dont have to cover like, every inch, but if you try this I would absolutely suggest plot resetting the normal way as well. I missed several open spaces the first few times where villagers could have moved, and would have had I not plot reset!
But now i have 5 of them all in a perfect row and it's the most satisfying thing *_*
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Someone posted a guide on how to do this:
http://www.belltreeforums.com/showthread.php?418162-Moving-villagers-where-you-want
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It also works with all villagers, not just Amiibo ones.