What Is The Best Way To Position Cameras For a Stairwell Shot?

Just looking for people's perspectives on coverage of corridor & exit stairshafts. I have 6 stairwells, 10 stories each, not unlimited budget.

My thoughts are:

1. Best view of face if mounted on wall, however it seems like a waste of a camera view as it is not going to capture much except coming and goings.

2....

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