Hi there, dear sirs! We would like to up the infrastructure for 3 Atlassian products for first time: Jira Service Desk, Confluence and Jira Software on a single server based on CentOS 7, Apache / Ngnix http server and Postgre SQL DB. For each product we planned something about 20 users, 15 projects and 200 nodes in Сonfluence, 100 issues per month in Service Desk. How much RAM, number of cores, and CPU time does single server need to service our needs? Is it normal to use each of the Atlassian services as a single application on a shared server and how stable is it, or is it better to use Docker system containerization for everyone right away? Thank you in advance!