There is nothing wrong with '2 or More Persons', in fact, some would argue that it's the only option.
Since 'people' is a singular collective noun in its own right, with its own plural, it should not be used as the plural of persons when referring to a specific number of individuals. One person. Two persons. Several people.
Etymologically speaking, since people and person have two entirely different roots, there is no foundation for people to be the plural of person. As you would expect, there was a time when people was never used as the plural of person, but today, obviously that is no longer the case. The word 'people' is evolving on two fronts, both in itself as a plural collective, and as plural form of persons. Of course, it continues to retain its own plural form - peoples.
For the reasons stated, I prefer '2 or more persons'.
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