1 unit per box/carton LTL shipment

I have to send 30 units of a product to FBA warehouse. Each unit is heavy, not too large and has its own box to contain it and protect it. It’s in ideal packaging to be shipped as it is. My question is that how to do carton labeling and FNSKUs work in this scenario. Do I stick them both on the external carton because ideally, I would like Amazon to use the external carton while sending the product to the customer for additional security?

So 30 units with their own packaging + carton enclosing each unit. I want Amazon to consider the whole as product while sending forward. How to handle carton labels and FNSKU both in this case. Stick them both? or What?

Can I just stick the FNSKU labels on the boxes and put them on the pallet without the box/shipping label and put the shipping label on the outside of the pallet?