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A Gameplay Location is a structure that contains a gameplay tag and a weak pointer to an object implementing IGameplayLocationQuerier. It represents a generic 'description' to a location that can dynamically be resolved (on-demand) on the context object it carries.

You would usually resort to using Gameplay Locations when just the idea of a location means more than the actual FVector coordinate itself.

Whether instances of a class implementing IGameplayLocationQuerier resolve a certain tag is determined at compile-time. See UGameplayLocationSettings.

You can resolve the tag of FGameplayLocation by calling Get(), which returns an FVector.
The structure also supports implicit conversion to FVector, which is the same as calling Get().

Unless you want serialization, it is not necessary to mark your Gameplay Location class member with UPROPERTY, as FGameplayLocation uses TWeakObjectPtr internally, which will always return nullptr if the object underneath was destroyed.