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If you try to do it, you can get error messages about virtualization support during installation, flexVDI manager and flexVDI guests can have problems accessing the network, and you can experiment other errors. Even if everything works, performance of nested virtualization will be so bad that it won't be useful even for evaluation/testbed.
Q: During manager installation, when it reaches 60% I get a message "the process is terminated". What can I do?
A: This happens when libvirt is not able to start the flexVDI manager virtual machine.
You can look in /var/log/libvirt/libvirtd.log and /var/log/libvirt/qemu/flexVDI_Manager.log to investigate the cause of the problem.