Essential cargo management accessories for the Rivian Commercial Van?

What are you guys using for cargo management in the Rivian EDV because the stock setup is driving me insane. I just took delivery of my van for my route in Seattle and everything is sliding around back there and the built-in rails dont even fit the straps i already own which is just so frustrating.

Im looking for bins or divider systems that actually lock into the floor because right now its a total mess every time I hit the brakes. Got a 2000 dollar budget to fix this before my busy season starts next month and i really need to get organized before I lose my mind...