There's something I did not properly understand. You say that you do not want the host to be accessible from the guest.
But want the virtual machines (.ova's) only see each other, not the host system!
On the other hand, you want the host system to be accessible via SSH from the guest
host system (win server 2012) should only be reached by ssh (from guest)!
By guest, do you mean an external machine? In any case, I advise you to try the different connection options to see which one fits your needs. I would go for NAT, but then the VMs would not be easily accessible from external machines. If you want to restrict how the VMs access the host machine, you can configure your host firewall as well.
Hope it helps.
Javier J. Salmerón
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