I think kinda what your thinking along the lines of center then absolute displacement could work.
I'm going to try making the sprite 2 or 3 times its size, then relatively displace the sprite to half its size, since displace doesn't actually change the size or position of an objects bounding box this should work.
In terms of were there actually placed, they would be overlapping each-other significantly.
but all my terrain collision will be based off of an array, so It shouldn't matter.
I'll let you know what happens.