Does Omnibus install support multiple gitlab servers on a single machine?

We would like to run multiple installations of gitlab on one server machine. It is possible to use the Omnibus install for this or should we use the source method of install?

If source is recommended where might one find install documentation for a Redhat or Centos V7 install?

Best way would be to isolate the different versions using docker containers. To obtain the docker images, check out https://gitlab.com/gitlab-org/gitlab-ce/tree/master/docker