How to make script run only when an object is placed? help?

My script has doesn't work when its parent, a tower is placed. Script:

local me = game.Workspace.ExampleTower
local TS = game:GetService("TweenService")
repeat wait()
	
until script.Disabled == false
--      [VARIBLES]
local attackTime = 2 -- attacks every 5 seconds
local attackDmg = 2 -- attacks do 5 damage
local attackrange = 30 -- 40 stud attack range
function rotateYAxisToFace(originalPos, lookAtPos) return CFrame.new(originalPos, Vector3.new(lookAtPos.X, originalPos.Y, lookAtPos.z)) end
function checkParts() 
	local close =  math.huge
	local  name
for _,v in pairs(game.Workspace:GetChildren()) do
	print("checked:"..v.Name)
	if v.Name == "Example Enemie" then
		print(v.Name)
		local dis = (me.Position - v.Position).magnitude
		if dis < close then
			close = dis
			name = v
		end
	end
end
return name
end
	



function shoot(object)
	--shoot
	print("shot!")
	local arrow = Instance.new("Part", me)
	arrow.Anchored = true
	arrow.Position = me.Position + Vector3.new(0,0,-1)
	arrow.CanCollide = true
	local goal = {}
	goal.Position = object.Position
	arrow.CFrame = CFrame.new(arrow.Position,object.position) 
	local TI = TweenInfo.new(0.1, Enum.EasingStyle.Linear)
	local tween = TS:Create(arrow,TI,goal)
	tween:play()
	wait(0.1)
	arrow:Destroy()
	object.Health.Value = object.Health.Value - attackDmg
end
while true do
	local en = checkParts()
	me.CFrame = rotateYAxisToFace(me.Position,en.position)
	local distance = (en.Position - me.Position).magnitude
	if distance <= attackrange then
		shoot(en)
	end
	wait(attackTime)
end 

make the script disabled. then detect when the object is placed, when it is, make the script.Disabled = false, which enabled it.

--This is an example

script.Parent.Touched:Connect(function()
game.Workspace.Script.Disabled = false
end)