I'm not sure exactly what you mean by multi-tenant account. With that said, every customer has been provisioned by Launch at this time. You should be able to log into launch and create a web property whenever you'd like. When you're ready to publish into production, you can link your embed codes to your DTM web property.
We have a shared contract and shared account or "multi-tenant" arrangement. For example to upgrade to AEM 6.3 we needed to coordinate because we share server space. Our Target accounts are linked and have 1 set-up.
For starters we aren't provisioned...it lists us not having access on our activation page.