Simple single IP configuration with port forwarding

I have a Hetzner server, with a single IP, running Debian.

I don’t want or need additional IPs, if I ever need incoming connections on a VM port forwarding is more than enough.

I use KVM and run a Windows VM (already running, configured it manually before cloudmin) and I want to use Cloudmin to easily add a few more Linux VMs.

I don’t have any experience with Cloudmin or managing multiple VMs, but It seems to me that Cloudmin by default will try to use complex bridging modes and assign real IPs (which I don’t have or want) to all VMs?

Is there any way to disable all this and make all VMs simply use NAT, and my single IP?