It's all going to get a lot worse when the EU foolishly ban Halon.
As for DG, always stick pallets of RFL and RFG opposite corners to ROX.
It makes sense, is safe and should be "best practice".
As for the CAO issue, I'd rather have it in the main hold, then you can see if the pallet is damaged, especially in the dark. Very easy for a loader to miss a slightly broken pallet of Class 3 PKG I nastiness if it goes in the LD, a lot easier to see and smell if it goes on the UD.
This will be interesting, as it appears the A/c broke close to the wing spar and then ignited something. Anyone have a copy of the manifest and loadsheet?