Juniper MX pppoe subscriber access redundancy

I've been trying to learn about subscriber access on Juniper. If you want to run pppoe subscriber access everything would work fine on one router but how would you design a solution that has next hop redundancy? (Put in a second MX for redundancy)

There are no IP addressing on the subscriber facing interface so you can't VRRP or anything like that. The only config is the VLAN, encapsulation ppp-over-ether and the profile.

​

​

Thanks