It does not seem that Foreman is capable of matching a subnet to ovirt network. When you switch subnet on the interface edit page it does not affect the ovirt network. I’ve found a PR that seems to provide this feature but it doesn’t look like it got merged and the last comment seem to indicate the PR need some more work. The feature request #18088 says blocked by #10539 which is closed but no more updates after. Was this idea abandoned or am I missing something?
No equivalent in foreman ATM, but PR submitted .