Deployment of VMs running cluster services

[David Ortiz]

Hello,
     Does cloudstack have a way to specify that two or more VMs should not be 
launched on the same host?  The only thing I could find to try and do it is to 
use tags to make them launch on different hosts, but I was curious if there is 
a way to say I do not care which hosts they deploy on as long as they are not 
on the same one.
Thanks,      David Ortiz