Does Passbolt Pro Business support creating an HA setup?

We are considering purchase of the Passbolt Pro Business license, and while going through the feature comparison (we currently use FREE), we saw that the Business version only supports “one instance”, but Free and Corporate support “unlimited”.

Does this include instances for HA (which by its nature have the same data) or is this then basically “prohibiting” HA and creating a funnel into Corporate tier (which would be unfortunate)?

We are considering Business for SSO, escrow etc and would probably still stick with Business, but getting this answered would help a lot :).