TL;DR: No.
It's possible the previous responses were based on hardware that is no longer included with this stand. I just bought one today (11/2018) based on these responses and I can unfortunately say without fear on contradiction that there is absolutely no way to connect this hardware with my Sonos Play:1 speakers. Even with the most creative use of these brackets, they simply will not work with these speakers.
I will be returning these stands and getting a refund.