When Redhat/CentOS is installed, it only installs the drivers for the currently connected hardware. That means it will not have the necessary drivers to boot and connect to the network when you import it from another hypervisor.
After importing, perform the following:
Change all of the hard drives to virtio-scsi.
Change all of the NICs to virtio.
Change the boot order of the hard drives so the OS is order ID 0.
Boot the VM. Hold left shift during the boot menu, then select the rescue option.
Once booted, log into a terminal and run:
sudo dracut -f --regenerate-all --add-drivers "virtio virtio_pci virtio_blk virtio_net virtio_scsi"
Reboot and verify that it boots correctly and can connect to the network.
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