In your experience, is a single OpenVPN server sufficient on such a network, or is it possible to have a fallback (server)? I previously tried using a distribu

In your experience, is a single OpenVPN server sufficient on such a network, or is it possible to have a fallback (server)? I previously tried using a distributed VPN setup without a single main server; that didn't work out so well however, mostly because the software was somewhat unreliable.