Though many pages and books of grammar suggest using either singular or plural verb after ( none) yet many would use a plural verb only when the noun after ( of ) = plural
Blue Book grammar : If the object of the preposition is singular, use a singular verb. If the object of the preposition is plural, use a plural verb
Pop Quiz in the same page:
- None of the chairs was/were comfortable.
Pop Quiz answer: None of the chairs were or was comfortable. But here : https://quizlet.com/438832873/chapter-6-flash-cards/
- None of the passengers __are upset with the new regulation.
As you see the only choice they suggest = plural verb
I don't know with whom, I would go.