Looking for help with lithium batteries & inverter installation

I am looking at installing some lithium batteries. In the past I have had BattleBorn’s but with so many new options I am looking at everything before I get more BB’s.

I also need to follow up on inverter installation, I know Brinkley provides a loop that I can cut and use to connect but I want to power both sides of the panel. Do I need to put this after the transfer switch?

Brinkley has a video on this but they didn’t make it clear. You take the loop of cable from the ceiling of the front compartment. Cut it in half and you will have the quick connects to wire it in to the existing AC power.