You can place multiple Zones in the same space, just put them on different layers and specify for each the type of info you want to be displayed.
A Zone Stamp and a Label are both entities that are associated with other elements (a Zone Stamp is always associated with the Zone element and actually is the sub-element of the Zone element, while a Label is a separate element and can be associated with many element types, and multiple Labels can be associated to the same element). So a Label cannot be associated with a Zone, because that is what the Zone Stamp is doing.
The best would be to make the Zone Stamp independent from the Zone element and make it a type of Label and that way it would be possible to place multiple Zone Stamps for one Zone element.
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