If you're looking to route traffic based on Geolocation then something like this might be helpful in front of your stacks. Since DO IPs are tied to a single physical location and cannot be multicast or otherwise refer to more than one location you would either need to have a single entry point (which could be a floating IP with failover handled by something like heartbeat), use a service like CloudFlare (which could be put in front of the failover / heartbeat / floating ip configuration), or use something like geoDNS to route traffic to the closest data-center, implementing failover in each DC individually.