Will you be providing this for bring-your-own-compute in general? There is a gaping hole in the market for this. All the big vendors that provide postgres as a service require you to be on very specific types of hosting like aws fargate, google gke etc (looking at you Crunchydata).
We are using Scaleway (french cloud) which is heaven when it comes to GDPR and Schrems compliance, but once we grow out of their managed db offerings or if we want something their managed db offering does not provide we are out of luck.
Been looking for a year more or less now and I am simply unable to find something that doesnt amount to us just paying a fraction of a consulting FTE to be our lightweight DBA. There are only so many ways you can set up postgres HA, it is amazing that no one has made a product out of doing it for someone else yet.
