It is possible to run E.F.A. on a VPS that only grants you the option to do a bare installation of CentOS.
Note that this is only for experienced users and should be avoided for normal usage unless you really have to.
Warning: Building E.F.A. should only be done by users with extensive Linux knowledge.
You will need the following requirements:
yum -y update
yum -y install wget screen
chmod 700 prepare-build-without-ks.bash
After building the system you will need to follow the normal Initial Configuration.