Off the shelf? Edgerouter lite can do 1Gbps dual wan with load balancing and failover. Not sure if it can do 2. Otherwise building a pfsense/opnsense box would

Off the shelf? Edgerouter lite can do 1Gbps dual wan with load balancing and failover. Not sure if it can do 2. Otherwise building a pfsense/opnsense box would probably be the route you want to take.