Yes, you can.
Be mindful of NIC throughput limitations of the host. I've seen someone shoot themselves in the foot before by having multiple scan-server VMs on the same host, wondering why they were having connectivity problems when each/every Filer was essentially talking to the same box
You might be confusing our solutions...
VSE for Storage is to provide AV coverage to Filers (NetApp for example) - the "VSE for Storage" solution is an installation of VSE to a server, which can be a VM if you want.
MOVE is to provide AV coverage to VMs.
So if you have a Filer to protect, then you want the Storage solution. If it's the VMs you want to protect then you don't want the Storage solution - you'd want either VSE itself or MOVE.
Thanks wwarren, that's right, but what I meant was if possible use VScan Ent. for Storage for the storage server and MOVE for others servers.