Run every site on the same setup, without rebuilding it each time

No. Each site reports on its own. Pricing, products, memberships, tags and credit balances can be shared across sites in a group, but there is no single aggregated dashboard across them.

Shared: pricing, products, memberships, tags and credit balances. Kept per site: hours, bays and branding.

Yes. Credit balances and memberships can be shared across the sites in a group, so a member is not restricted to the site that sold them.

Every location runs the full platform under one parent account, so site three works the way site one does. Pricing follows the bay count at each site.