How to choose the right PDB and how to use it

Hey, need some help with PDB (Power Distribution Board). my power supply input is six 12S (44.4v) batteries, and my output is six ESCs. The nominal current I use is 350 Amps, and the peak is 600 Amps.

I’ve searched online for a fitting PDB. the thing is, all the PDBs I find have 2 batteries input (whereas I need 6) .

Now I figured I could attach three batteries via their cables, or just use two copper plates (+,-) and use it as a power panel.

I dont really know if any of my ideas would work, need some guidance.

Any thoughts?