Probably depends on what direction you think you will go in long term. Companies tend to gain knowledge and expertise over time so it less common to to shift ho

Probably depends on what direction you think you will go in long term. Companies tend to gain knowledge and expertise over time so it less common to to shift hosting models (except early on). At just one rack, if you want to own hardware you would usually just rent a single cabinet (Can be pretty cheap depending on location). The number of servers in a rack is variable depending on the power. We got 208v / 30A , so we can pretty much fill up a rack with redundant power. In our main facility, we currently have 4 racks in use which are not full yet and a 5th already provisioned for growth.