To set up dual ISP load balancing and failover using L2L VPNs to an external VPS, I suggest that you dedicate a VPN for each connection. That way, you have more control over the individual ISPs, and it can give you better performance and reliability, especially if one connection goes down. You could use BGP to manage the routing between the two ISPs and automatically switch to the backup if the primary ISP fails. It's a bit of work setting it all up, but once it's running, it's super smooth. I'd also recommend monitoring your connections regularly to ensure everything works as expected. A dedicated vpn helps keep things stable.