Hello,
Recently I've run Hub&Spoke Archictecture Project for my company and have tried all vNET, Subnet and Gateway secnarios. I've quite experience about NSG, UDRs, Route Tables and related Azure services. I'm also running a DR on Azure project for my company. 350 VMs will be replicated to Azure. Because of this project, I've gained experience about Express Routes, bandwidth considerations and VPNs. I'll be happy if I can help you. Thanks in advance.
Kind regards,
Ramazan