Per the spell description:
Anything inside the extradimensional space drops out when the spell ends.
The space can hold as many as eight Medium or smaller creatures.
Given that a medium sized creature occupies a 5ft square, that would mean there is at least 200 sq ft of extradimentional space.
If I wanted to lay a trap below where someone cast Rope Trick, do I need to cover the full 200 sq feet? Or do they all fall on top of each other centered on where the rope went up?
In a more concrete example, could I just make a 10 sq ft spike trap centered on where the rope is (was if pulled up), or could character crowd the "edges" of the extradimentional space and fall outside of the pit?
For clarity: Since I'm basing this off a a question where the characters are only 7ft up, I'm not concerned with falling damage, nor will there be time to twist and turn during descent to avoid the trap.