question

I would not use the PersonLabels table for that task. It includes people that have left the model.

I would probably make a Group in the toolbox, and then, right after your Create Person activity, I would add them to that group, using a Custom Code activity with code like this:

Group("MyGroup").addMember(token.Person)

The nice thing about groups is when the person is removed from the model, they will also be removed from the group.

Then you can loop over the group:

Group people = Group("MyGroup");
for (int i = 1; i <= people.length; i++) {
  Object person = people[i];
  Vec3 location = person.location.project(person.up, model());
  // do something with location
}

The reason for the call to .project() is because the person might be in a location, and when they are, their position is relative to the location, not to the overall model.