I don’t think using an address would work for a project as it is just a point, not a place with an area. You want an area that all your focal observations would be inside. It sounds like you need to create a place for your project. You should check out previous posts like these for info (I’m sure there are others too):
https://forum.inaturalist.org/t/how-to-create-a-new-place-on-inat/3281
https://forum.inaturalist.org/t/how-to-add-new-place/10321
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