OK heard from my vendor.
They agree that the HPE website saying that iLo Essentials only supports DL380 e-series is kinda hidden and are going to see about refunding me that license.
As for the Insight Manager iLo license, they claim that it is what I need at the best price. That this license alone will allow me to run Insight Manager, and use iLo Advanced features all inclusive in this license, which seems odd as it's a less expensive license than just iLo Advanced by itself.
I'm currently downloading Insight Manger - I guess we'll see what I see.
Though I only have one server currently that I need/want to manage - running Insight Manger is overkill for one server. And, where am I suppose to run Insight Manager?
more digging.