Help with using welds to connect a part to a plate

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#1
  1. What do you want to achieve?

I am making a Plates of Fate style of game and want any Parts I spawn onto a plate to be welded onto it. So if the plate grows in size or starts spinning or just moves in any way at all, the Part will move with it.

  1. What is the issue?
    I can’t figure out how to do it correctly, the Parts are either 40-80 studs in the air OR if I do manage to get it to move with it, the Part is perfectly inside the plate.

  2. What solutions have you tried so far?
    Combinations of different calculations in the Welds, using WeldConstraints to try to achieve the same effect.

This is the code I currently have right now. (It gets called from an external script as it is a ModuleScript)

local function getRandomPlateMidRound()
	platesFolder = workspace["Play Area"]:WaitForChild("Plates")
	local plates = platesFolder:GetChildren()
	if #plates == nil or #plates == 0 then
		return false
	end
	local randomPlate = plates[math.random(1, #plates)]
	return randomPlate
end

local function randomOnSurface(part)
	local x,y,z = part.Size.X,part.Size.Y,part.Size.Z
	local xPosition = math.random(-x,x)
	local zPosition = math.random(-z,z)
	local middle = part.CFrame + part.CFrame.UpVector*(y/2)
	local rx,ry,rz = middle:ToOrientation()

	return CFrame.new(middle*Vector3.new(xPosition/2,0,zPosition/2))*CFrame.Angles(rx,ry,rz)
end



...

PlateEvents.SpawningPartTest = function(timer, targetCount)
	local eventDesc = "PART SPAWN TEST"
	countdownTimer(timer, eventDesc, targetCount)
	for i=1, targetCount, 1 do
		local randomPlate = getRandomPlateMidRound()
		if randomPlate ~= false then
			local part = Instance.new("Part")
			part.CFrame = CFrame.new(0,0,0)
			part.Color = Color3.new(0.337255, 1, 0.0941176)
			local weld = Instance.new("Weld")
			weld.Part0 = part
			weld.Part1 = randomPlate
			weld.C0 = (randomOnSurface(randomPlate))
			weld.C1 = (randomOnSurface(randomPlate))
			weld.C0 = weld.C0 * CFrame.new(0, randomPlate.Size.Y, 0)
			weld.Parent = part
			part.Parent = randomPlate
			
			
			highlightSelectedPlate(randomPlate)
			playPopSound(randomPlate)
			task.wait(0.35)
		end
	end
	task.wait(1)
end