Ports precision placement of items

code/game/objects/items/stacks/stack.dm

@@ -13,6 +13,8 @@
 	gender = PLURAL
 	origin_tech = list(TECH_MATERIAL = 1)
 	icon = 'icons/obj/stacks.dmi'
+	randpixel = 7
+	center_of_mass = null
 	var/list/datum/stack_recipe/recipes
 	var/singular_name
 	var/amount = 1

code/game/objects/items/stacks/tiles/tile_types.dm

@@ -14,13 +14,13 @@
 	name = "tile"
 	singular_name = "tile"
 	desc = "A non-descript floor tile"
+	randpixel = 7
 	w_class = ITEMSIZE_NORMAL
 	max_amount = 60
 
 /obj/item/stack/tile/New()
 	..()
-	pixel_x = rand(-7, 7)
-	pixel_y = rand(-7, 7)
+	randpixel_xy()
 
 /*
  * Grass