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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