I'm not aware of an auto setting, but it will place the stamp where you confirm (hammer) the room. Typically, I pick the center of the geometry or, if equipment, casework, and/or furniture is visible, in a clear area of the floor.
If I have a line of spaces and want the stamps to line up, I will either set a guideline before or after the first placed stamp, or I will drag copies and then go back and edit the zone id.
Hope this helps.
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