Multi-Wan with duplicate gateways

[db]

I intend to set up multiwan with two services from the same provider (for throughput, round robin). The provider is cgnat so each interface will receive ips in the same subnet and will both have the same gateway.

This leads me to believe I will have issues with routes. For one thing it seems there is an autogenerated route for the gateway ip to a specific interface, and routes for any configured dns and monitor ips to that gateway ip. Obviously that wont work.

My question is, will opnsense just perform magic to make this work somehow?

Or if not,  think this is something i can resolve myself with static routes? Will i have to disable any automatic routes?

Thanks!