ID:1796417
 
(See the best response by Kaiochao.)
Is there a quick method for making large objects go below mobs(bounds bigger than one tile) but above regular turfs using side-view?

Best response
I'd try using BACKGROUND_LAYER (or maybe TOPDOWN_LAYER) for both turfs and your large objects. I think it's meant for flat layering in non-flat perspectives.
thanks