CentOS 8.1.1911 has a bug in the installer. It is not possible to use more than one NFS repo via kickstart repo directive as the installer tries to mount all of them on /run/install/.nfs. You get this
DBG payload: /run/install/.nfs already has something mounted on it
message for all but the first one. The problem was reported for Fedora 29/30.
https://bugzilla.redhat.com/show_bug.cgi?id=1669711
Do we know if this is fixed in RHEL 8.2?