OpenProject on Centos 7

Hi. We are going to provide our teams the possibility to manage their projects via OpenProject to be installed on a single CentOS 7 machine. We need multiple instances of OpenProject to be indipendently managed by each single team so that different confgurations / plugins can be separately installed without any kind of interference with the other setup. Our CentoOs 7 server is currently managed via Webmin + Virtualmin, and is already hosting several web-projects via Apache, some only accessble on the intranet, while others available on the internet. We need line by line commands to check and download/update any requirement (ruby, rails, postgresql, etc...) to configure OpenProject ([login to view URL]) on our Centos 7 server after installing it via yum. (instructions for the standard installation here: [login to view URL]) So, currently we have Apache already installed and running and we cannot complete the OpenProject Configuration Wizard part dealing with Apache and PostgreSQL, since we cannot overwrite the Apache2 directives already configured (up and running) on the server, and we want separate OpenProjects instances to be available on separate subdomains via Apache. Also, we need some way to configure Apache to be a proxy for the local OpenProject installation. You can deliver one of the following, and we would agree on the final price accordingly: + a simple line-by-line shell command list to install OpenProject on an existing Centos 7 machine; + a shell script or python script automating everything based on an external configuration file to be fullfilled according to my data (PostgreSQL user, password, Apache directive path, etc...); + a Webmin plugin to manage OpenProject installation / configuration.