I have Spotify Premium and it works great with the Harmon Invoke smart speaker. Since I have a family, I was going to switch to Spotify Family, but will the Invoke work with Spotify Family plan?
It won't make a difference, as Spotify Family is multiple accounts that are linked to the same bill. When you upgrade to spotify family, you can create invites to other people (who already have free Spotify accounts set up) and the Invite will upgrade them to Premium. You have to confirm your address and things might not work if too many members have completely different addresses.