Ninja'ed! Well, here's my complete post anyway, but I'd say if you don't mind putting twice as many anchors on tiles, then more power to you! I think the railing solution is the way to go, and shouldn't look too odd.
I wouldn't be worried, as long as the anchors don't get in the way. I used anchors underneath pieces when I was working on walkways. From what I recall, it wasn't a complete joy slotting the anchors into the posts (you know, you get one in, one pops out...), and it certainly makes terrain that should be removable harder to, er, remove.
Another thing to try might be low railings that plug into the tiles. I can't remember which sets already have em, and which may not. I know a set like Thoumont's has em. They're easy to assemble, and when you plug them into the sides of the tiles, they help:
a) cover up the side of the tile, giving a nice, clean texture.
b) extend a little below the tile, giving more of a lip that holds things in place
They're also probably more fun to assemble than tons and tons more anchors.
That's my 2ยข - let me know how things go when you have a chance to really build out with the concept.