The first member is standing up at the first spot.
The first member is standing up on the first spot.
Which preposition is appropriate?
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The first member is standing up at the first spot.
The first member is standing up on the first spot.
Which preposition is appropriate?
At is used with places. If the "spot" can be considered a place, at can be used.
X on Y is used if
Y is a flat surface or object and
The feet or bottom part of X makes contact with the surface, or top surface of that object.
If the "spot" fulfills that criteria, on can be used.
It's possible both on or at will work and in that case it doesn't matter which you use.