What reference type are you using in Zotero? Are you citing an item from a published proceeding or a presentation? Zotero's "conference paper" seems to be for an item in a published proceedings book and the place is the place of publication. I may be wrong but here I include the location in the conference title field: 10th annual Zotero users conference, August 1 - 3 2020, Fairfax, VA, USA.(An imaginary event)
I use the "presentation" type for unpublished conference presentations.
For unpublished conference presentations, use the type “Presentation”, not “Conference Paper”. The latter is for conference papers formally published in proceedings.
I tried both options. What happens is that it is a presentation at a meeting/ conference, which is then published in an abstract book. If I use Conference paper, the place where it was held does not appear. If I use Presentation I cannot put the information that there is an abstract book.
APA does not include the place of an event in citations to published conference proceedings. It simply cites them like a journal article or book chapter.
Upgrade Storage
I use the "presentation" type for unpublished conference presentations.