Salvage spawning adjustments and AABBs in prototypes (#10789)

Content.Server/Salvage/SalvageMapPrototype.cs

@@ -1,5 +1,6 @@
 using Robust.Shared.Prototypes;
 using Robust.Shared.Utility;
+using Robust.Shared.Maths;
 
 namespace Content.Server.Salvage
 {
@@ -18,11 +19,11 @@ namespace Content.Server.Salvage
         public ResourcePath MapPath { get; } = default!;
 
         /// <summary>
-        /// Size *from 0,0* in units of the map (used to determine if it fits)
+        /// Map rectangle in world coordinates (to check if it fits)
         /// </summary>
         [ViewVariables]
-        [DataField("size", required: true)]
-        public float Size { get; } = 1.0f; // TODO: Find a way to figure out the size automatically
+        [DataField("bounds", required: true)]
+        public Box2 Bounds { get; } = Box2.UnitCentered;
 
         /// <summary>
         /// Name for admin use