If you are referring to connect two Edge VMs to the same N-VDS, yes you can. Actually you can grow in an Edge Cluster up to 8 Edges.
And i also do not know if there is a limit of Edges per N-VDS
not nested, assume that you have physical ESXi hosts and a cluster of them you are ok from resources, then how many EDGE VM are possible to be connected over same NVDS or VDS?
that is the maximum system-wide but it not specifically enough to say that 320 EDGE VMs can be connected using the same Distributed Switch, probably I'm overthinking the s...stuff I need to sleep a bit....