@ManivelR,
I am not sure which VCF version you're referring here, I would assume its VCF 5.x environment greenfield deployment that you're talking about and sharing details for the same, please revert if otherwise.
I am sure the below guides will be of help.
https://www.vmware.com/docs/vsan-stretched-cluster-guide
https://techdocs.broadcom.com/us/en/vmware-cis/vcf/vcf-5-2-and-earlier/5-2/map-for-administering-vcf-5-2/stretching-clusters-admin/stretch-clusters-requirements-admin.html
Regards,
Shen