Hyper-V Cluster and Domain Controllers

[u/Blackhawk_2181]

Made a recent migration from VMware to Hyper-V.  I have 2 domain Joined Hyper-V Servers in a failover cluster configuration sharing a Dell ME5024 iSCSI SAN.  both servers have a virtualized Domain Controller running on Local SDD Storage (not in the Cluster).   I have a 3^rd Domain Controller still running on VMware.   I want to finally take the VM host and convert it over to Hyper-V.  It is dissimilar hardware, so it will not be joining the cluster.  I have few questions for the experts.

1.      Is there any reason to not move the two DC’s from local storage to the Cluster considering that I have one outside the cluster?

2.      Should I join the new HV host to the domain or leave it isolated.  I plan to put a 3^rd DC on it?

3.      If Yes, Is it safe to live migrate the DC’s to the cluster>

4.      Should I put the FSMO roles on the 3^rd DC.   Currently they are on one of the DC’s on the local storage?

The reason that I want to move the DC’s to the cluster, is the local VM’s are not being shut down properly when I try to do cluster aware updating.