Hi, We have a Whitelabel B2B product and I'm researching if Supertokens would be a viable Authentication service for us. Each of our clients needs to have a custom-styled frontend for login/sign up on their own domain but we need a single common pool of user accounts so an end user can sign in to any client they have been invited to. Reading through your Multi-tenancy docs it seems as though the architecture we would need for this is "Single tenant, multi app", is this correct and if so how does that work with your self-hosted pricing model as it seems apps ($50/m) are much more expensive than tenants ($5/m)?