Redundant carp mesh best practices

Hi, I have an ospf mesh running between routers 1, 2, 3 and 4. i have a
bridge with a vether running on 1 and 2 each connecting to 3 and 4. i have
a trunk running on 3 and 4 each connecting back to the previous 1 and 2.
the reason for this setup is the bridge on 1 and 2 faciliates transferring
the carp multicast frame between 3 and 4. I’m wondering if this is the
current best practice or is there a better way?

Image: https://i.redd.it/4i1lu4aeydzb1.jpg

Thanks!