Hope this drawing helps. Not my panels or meter but its the same thing at the end of the day.
I have 400amp service at the meter base. From there it branches off into two 200 amp panels. Seems like I need to add a new double pole breaker into each panel for the UA and UB connections, UN ties into my neutral bus. IA CT and IB CT clamps go on my mains coming into each panel. Rinse repeat for each panel.
I think the best bet honestly will be for me to get a new box with a DIN mount inside (Either factory or I will add one) to house the two iammeters. From there run conduit to each panel so no exposed wire. Should be clean and safe. Sound like a solic plan?