ST - pretty much you hire us to do anything for a data center. I don’t know the specifics but I think if the customer wanted, the EMS might cook breakfast for you as well. You get full control of everything
MT - Shared everything. The E10 app is used to isolate tenants from each other. That’s why you see limits placed on things like no C# in server widgets and limits around UD fields - least common denominator customization for a discounted price. For plenty of customers, this is all they need (Still the most popular offering btw even with the limitations).
DT - New kid on the block and fastest growing. Isolated DBs on a shared DB Server. IIS Apps are also isolated to each Tenant with separate App Pools per tenant. Multiple Tenant are on the same app server but in separate Application in IIS. Each tenant has a separate Windows Identity stamped on the App Pool and granted access to SQL via that identity (Windows Auth access to their DB and their slice of the file system). So the Windows OS is used to provide isolation between tenancies. SaaS Ops can balance the hardware and moves tenancies around as needed to ensure performance. More customization abilities since the OS is keeping the different tenancies isolated at a process level. We are still trying to get features to market to give this more of an on promise feel and is under active development SAFE HARBOR and all that