Mobile Boulder Trap Question

SirFency

Terrarian
I have a row of about 40 Boulder Traps. they all hang from a ceiling. below the ceiling there is a floor with a shaft going down in the center of the room. I need the boulders on the right side of the shaft to roll left when they land so they fall down the shaft. I need the boulders on the left side of the shaft to roll to the right so they fall down they shaft.

How do I make sure the boulders roll in the direction I want them to when they hit the ground?
 
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