My golden rule is distance and methods of separation.
If each play piece is at least 20m (or yards) apart and not enclosed. Then I will consider each piece as their own POI and address according to criteria.
IF 20m (or yards) apart BUT enclosed together. one nomination potentially depending on distance as sometimes some pieces stand apart from the rest of the play area
If each play piece is less than 20m apart and they are enclosed together. Definitely one nomination only.
I tend to not use duplicate. As a swing is a swing not a slide. So I use the accuracy criteria. I will use the reason field to say/call out description/title is wrong as it is a play area and there is a risk of nomination stuffing.
And like @SlimboyFat71 said my immediate suspicion is every play piece will be/has been nominated . So I tend to dig in a bit more…