esx/vmware question concerning datastores

[ftb3]

I'm trying to build a dashboard, and while I don't mind seeing them all individually, my leadership will want to see a 'total used vs free', but i can't figure out how to see the cluster as an entire entity. Is there a way to do that instead of showing all 28 individual datastores?

While I'm at it, is there a way to show total # of VM's instead of # per hypervisor?
I'm on version 7.0.3

TIA