We will be replacing our library's OPAC with Summon running over Ex Libris' Alma. Summon as the discovery layer with item records displayed in Alma. In testing out how that works at other institutions that have made the switch before us, I notice that Zotero isn't working well with books either from the results page in Summon (only gathering limited details about the books, no subject tags) or in the Alma records of individual books (saving as a web page with snapshot but doesn't grab any information about the book at all).

As an example (not my institution, ours isn't live yet) see:
For Summon results: https://emich.summon.serialssolutions.com/search?s.q=twain&utf8=?&s.fvf[]=ContentType,Book+/+eBook,f&spellcheck=true&keep_r=true#!/search?ho=t&fvf=ContentType,Book / eBook,f&l=en&q=twain

For Alma results page: https://emich.alma.exlibrisgroup.com/discovery/openurl?institution=01EMU_INST&rfr_id=info:sid/summon&rft_dat=ie=51120492890003656,ie=2198935700003656,language=EN&svc_dat=CTO&u.ignore_date_coverage=true&vid=01EMU_INST:Services&Force_direct=false

Currently using:
Zotero 5.0.43
Safari 11.1 (13605.1.33.1.2)
MacOS 10.13.4 (17E199)

Same results using Firefox 58.0.2 on the same Mac.

I've also gotten the same results using Summon over Alma implementations at other institutions.