How to randomize SurfaceGUI into different part?

I'm trying to create a board with nine squares. Every space includes a surfacegui that is independently controlled by a physical button. My main goal would be to create a button that will take all nine surfaceGUIs and shuffle them randomly in a different square. How would I execute this without any surfaceGUI placing itself in the same square as another?

--// this ColorGuis Variable is a table of the physical parts that contain screenguis
local ColorsGuis  = script.Parent.Parent.ColorGuis:GetChildren()

--// a screengui button, can use a physical ClickDetector or even touch to trigger this
--// just change this to your button and the event appropriately
local RandomButton = script.Parent.SurfaceGui.TextButton

--// random button hookup!
RandomButton.MouseButton1Click:Connect(function(blah) 
	local TabCopy = (function() --// Record and copy the original table containing The guis	
		local T = {} 
		for k,v in pairs(ColorsGuis) do 
			T[k] = v 
		end 
		return T 
	end)()
	local Guis = (function() --// Store the guis in a table and remove them from the game...
		local Tab = {} 
		for _,Gui in pairs(ColorsGuis) do 
			Tab[#Tab+1] = Gui.SurfaceGui 
			Gui.SurfaceGui.Parent = nil  -- This bit is optional, remove this is you don't like the idea of your guis dissapearing then reappearing..
		end 
		return Tab	
	end)()
	wait(1) -- wait a second (Optional!)
	--// now the meat of the function, randomizing the guis back into the gui parts
	--// cycle through the gui parts	
	for _,Gui in pairs(ColorsGuis) do
		--// select a random part from our copied table
		local Rnd = math.random(1,#TabCopy)
		
		--// select a random Gui 
		local SelectedGui = math.random(1,#Guis)
		
		--// Set this Gui parent to the selected Gui Part
		Guis[SelectedGui].Parent = Gui
		
		
		--// remove the Selected Physical Part from our copy and remove the selected Gui from our Gui table so we dont select it again!
		table.remove(TabCopy,Rnd)
		table.remove(Guis,SelectedGui)
	end
	--// Done!
end)

Should work if hooked up correctly, Hope I've left meaningful comments explaining what does what. If not let me know!