The outdoor mall at Simi has been losing tenants almost as soon as it open 10 years ago. There is almost no foot traffic for any of the stores. I have been surprised Apple stayed as long as they did.
The Northridge and Topanga locations are always very busy.
If they update my Echo Dot's via a software update, I would give it a shot. Most of my Dot's have Anker speakers attached to them. Just another option in addition to the AirPlay setup I also use.