There is a discussion on the EMCE forums where the main topic is actually this one. Yes, you have the possibility to use UniSpehere CLI for all the VNXE devices. The standard command should look like this:
uemcli -d <VNXe_mgmt_IP_address> -u service -p <Service_password> /service/system shutdown
To find more about it, access the forums where the command is explained: https://community.emc.com/thread/143830
