My approach is keep is light and simple.  Ply sheet on the floor with the fridge slide bolted to it - I think it's a Black Widow, was cheap at a show.  Ply is zip tied to the tie down rings - easy install and a few clips with the side cutters to get it out.  Qube-lock frame with light ply shelf over the fridge.  All behind a cargo barrier.  The zip ties were a quick install to get away on a trip but have become standard - easy to carry spares, never had one snap even on extended corrugations etc.
				
			 
			
		 
			
				
			
			
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1996 D1 V8 - gone
2002  D2 Td5 ES- gone but still running elsewhere
2013 D4 SDV6 HSE - gone
2023 Defender 110SE D300
			
			
		 
	
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