If you already have the Gateway and Powerwalls you might not need the Gateway. Kind of have to go through a process. So maybe not as simple as one size fits all.
If they can't install they take it back the product.
I was annoyed, but after 4 years of waiting, no way that was going to prevent me from taking delivery. The service center already held it for 7 days before notifying me...I only know when it arrived at the SC by reviewing the Sentry videos.