Nested Virtualization Setup

I am looking to setup nested virtualization.. I'm pretty new to nested virtualization and vSpheres networking

I was reading that enabling 'Promiscuous Mode' may have an impact on the rest of the environment. Is there a way to setup a nested host without enabling the promiscuous mode, or is there a way to isolate it in the same environment by adding it to a new port group on a new vSwitch with promiscuous mode enabled, would that prevent performance issues?

Help/Suggestions always appreciated