Intend to build a group of VPN servers in different country. So the network architect is required. He should be able to provide productive proof of concept. Here are components of VPN network:
1. Multiple SoftEther VPN servers installed in different countries
2. Radius server (to be recommended)
3. Proxy server (to be recommended)
The network architecture and design should be able to escape from censorship and blocking. Your proof of concept is required.