Changing the `max_z` value in the ground_spawns table appears to work, but remember you need the zone to reload for the change to go live. 
 
This is however an absolute pain to do, I would much prefer if there was a command to change them in game like with objects. 
 
TBH, I am not sure they are actually implemented correctly now anyway. It looks like they are supposed to spawn within a range of values, which is implemented for the X and Y coords. Z only has a max value, I assume the old best Z code automatically looked after finding the min_z value. 
		
	
		
		
		
		
		
		
		
		
		
	
		
		
	
	
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