How to place a particle at the top of a Part?

I want to create a particle effect or part at the top of Part, but I can't make it work. Here's my script:

		local Plr = player
		local GroundWave = game:GetService("ReplicatedStorage").Spawncuccok.TesztPARTC

		local char = Plr.Character
		local mouse = Plr:GetMouse()
		local Humrp = char:WaitForChild("HumanoidRootPart")
																																	
		task.spawn(function()
			for i = 1,3 do
				local wave = GroundWave:Clone()
				wave.Parent = Humrp 
				
				wave.CFrame = Humrp.CFrame * CFrame.new(0,-2,0)
				
				game:GetService("TweenService"):Create(wave , TweenInfo.new(1),{Size = Vector3.new(175, 2.3, 172)}):Play()
				wait(0.3)
				game:GetService("TweenService"):Create(wave , TweenInfo.new(1),{Transparency = 1}):Play()
			--	print("part spawnolva!") debug
			end
		end)
		for i, v in pairs(char:GetDescendants()) do
			task.wait(5.5)
			if v:IsA ("TesztPARTC") then
				v:Destroy()
			 end
			end