Maybe it's time to open a 'vitualization' section on the forums...
no..
there are already some topics and similar requests.. the answer is "no, it's not necessary as SME works as a VM as long as linux virtual machines are supported"..
i.e. it does make no difference if you use virtualbox on your laptop or a very big cluster with a very expensive version of vmware: SME is always the same.
finally, I would add that nowadays, when we (generally speaking) need more servers (defferent O.S. or different version), we should always install something like esxi or proxmox on the bare metal.. installing vmware server or virtualbox inside SME is not a good idea
All IMVHO