Placement System does not work for certain items?

So I basically have the whole thing made but I run into a slight problem, if the Items Hit box is equal size in X and Z, I don't run into this problem but if one Side is bigger than the other, the longer side will hang of the edge of the grid, any help would be appreciated

--localscript

function Collision(ItemClone)
	local Platform = game.Workspace.Platforms:WaitForChild(Player.Name.. "'s Facility", 100).Base["Base Tier 1"]
	local Visual = ItemClone
	
	if Visual:FindFirstChild("HitBox") then
		local Hitbox = Visual.HitBox
		local TycoonBase = Platform
		local TycoonBaseSizeX, TycoonBaseSizeZ
		local HitboxSizeX, HitboxSizeZ 
		
		TycoonBaseSizeX, TycoonBaseSizeZ = TycoonBase.Size.x, TycoonBase.Size.z
		HitboxSizeX, HitboxSizeZ = Hitbox.Size.x, Hitbox.Size.z
		
		local TycoonTopLeft = TycoonBase.CFrame * CFrame.new(Vector3.new(TycoonBase.Size.x/2, 0, TycoonBase.Size.z/2))
		local BaseAngleX, BaseAngleY, BaseAngleZ = CFrame.new(TycoonBase.Position, (TycoonBase.CFrame*Vector3.new(1, 0, 0))):toEulerAnglesXYZ()
		local VectorRotation = CFrame.Angles(BaseAngleX, BaseAngleY, BaseAngleZ)
		
		--- Get Platform Region ---
		
		local BasePosition = Platform.Position
		local BaseSizeOffset = Platform.Size/2
		local BasePoint1 = Platform.Position - BaseSizeOffset
		local BasePoint2 = Platform.Position + BaseSizeOffset
		local BaseRegion = Region3.new(BasePoint1, BasePoint2)
		local XPos, ZPos = Mouse.Hit.p.X, Mouse.Hit.p.Z
		
		XPos = math.floor(XPos/2.5 + 0.5)*2.5
		XPos = math.min(XPos, (BaseRegion.CFrame.p.X + BaseSizeOffset.X)-(HitboxSizeZ/2))
		XPos = math.max((BaseRegion.CFrame.p.X - BaseSizeOffset.X)+(HitboxSizeZ/2), XPos)
		
		ZPos = math.floor(ZPos/2.5 + 0.5)*2.5
		ZPos = math.min(ZPos, (BasePosition.Z + BaseSizeOffset.Z)-(HitboxSizeZ/2))
		ZPos = math.max((BasePosition.Z - BaseSizeOffset.Z)+(HitboxSizeZ/2), ZPos)
		-- 2.5 == Pillar
		local HitboxSize = Hitbox.Size
		local YPos = (BasePosition.Y + BaseSizeOffset.Y)+(HitboxSize.Y/2)
	
		if Rotate then
			YRotate = YRotate + 90
			Rotate = false
		end
	
		local NewVector = CFrame.new(XPos, YPos, ZPos) * CFrame.fromEulerAnglesXYZ(0, math.rad(YRotate), 0)
		local RegionVectorMin = NewVector * CFrame.new(Vector3.new(HitboxSizeX/2, -Hitbox.Size.y/2, HitboxSizeZ/2))
		local RegionVectorMax = NewVector * CFrame.new(-Vector3.new(HitboxSizeX/2, -Hitbox.Size.y/2, HitboxSizeZ/2))
		local Hitboxes = game.Workspace:FindPartsInRegion3(
			Region3.new(
				Vector3.new(
				math.min(RegionVectorMin.x, RegionVectorMax.x),
				math.min(RegionVectorMin.y, RegionVectorMax.y),
				math.min(RegionVectorMin.z, RegionVectorMax.z)
				) + Vector3.new(0.1, 0, 0.1),
				Vector3.new(
				math.max(RegionVectorMin.x, RegionVectorMax.x),
				math.max(RegionVectorMin.y, RegionVectorMax.y),
				math.max(RegionVectorMin.z, RegionVectorMax.z)
				) - Vector3.new(0.1, 0, 0.1)
				), nil, math.huge
				)
							
				local ModelColliding = false
				for i, Hitbox in pairs(Hitboxes) do
					
					--- Repeated Variables ---
					local Block_Place = Hitbox.Name == "HitBox"
					local Not_Desc_Of = not Hitbox:IsDescendantOf(Visual)
					
					if Block_Place and Not_Desc_Of then
						ModelColliding = true
						Highlight.Color3 = Color3.new(1, 0, 0)
						Highlight.SurfaceColor3 = Color3.new(1, 0, 0)
						Placeable = false
					end
				
			end
				
		if not ModelColliding then
			Highlight.Color3 = Color3.new(0, 1, 0)
			Highlight.SurfaceColor3 = Color3.new(0, 1, 0)
			Placeable = true
		end
	
		LastPosition = NewVector
		Visual:SetPrimaryPartCFrame(Visual.PrimaryPart.CFrame:lerp(LastPosition, .2))
	end
end

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