I'd encourage you to start on page 46 of the VMware® NSX-T Reference Design as the edge and routing architectures in T are significantly different than NSX-V. Specifically, the N-VDS instances inside of an edge connect to a vDS so you'll effectively have both since the Geneve tunnel endpoint in NSX-T actually lives directly on the edge VM and not in the hypervisor like the VXLAN tunnels in NSX-V did.
Thank you for the design guide.
I have however gone through the design guide however it does not give design recommendation for collapsed compute and Edge cluster. It does give for collapsed Management and Edge cluster design.
N-VDS instances of an Edge can either be connected to port group backed by VDS or VLAN backed logical switches on N-VDS if it is to be deployed behind N-VDS in collapsed compute and edge cluster design. However i am not getting much details or documentation about it.
Please see this link: