2 DSL Modems from same ISP

I will have soon a second DSL modem from the same ISP and I’m looking for how to connect them to the RB1200 most efficiently.

Load Balancing would be an Option, right?

Bonding would this work as well? I can configure the Modems with the same internal IP@ or with different.
What would be the best for Bonding Scenario and how does it work really?

Thank you

Load balancing, yes.

Bonding is dependent on your provider.