Architecture question


I found the following link :

For one new projet for which the customer is currently buying the licence, I would like to know what is the minimum number of servers (VM) that need to be installed for one robot only in a Production environment. Do we really need to have 4 as written ? (we don’t want the Elastic search server)
Can we have both Studio and Orchestrator on the same VM?
Can we have only 2 VMs? In the case of 2 VMs, what would your recommendations be?

In such case that the recommendations (one VM for each component) are not followed, the UiPath support is it still provided?

Thanks for the help,