I think the one aspect going to kill your plans is that generally, they may NOT be operated over any land not owned by the operator , without permission of the land owner. of that land.
In New Zealand, the regulation of unmanned aerial vehicles (UAVs) does not distinguish between commercial and recreational operations, but rather sets out standard operating requirements for any UAVs that weigh less than 55 pounds. UAVs over this weight or operations that will exceed the standard operating requirements are subject to a certification process. Permission must be obtained to fly in certain areas, and the consent of the relevant persons must be obtained before flying over people or private property. Other relevant rules with respect to flying UAVs over public land or spaces may be established by local authorities and the Department of Conservation.
A couple of links which you should view before operating a drone anywhere in NZ.............and there are more; quite a lot more.
https://tinyurl.com/y2m5y9eg
https://tinyurl.com/ycsvj7h5
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