[Lua] How do i load script on run

How do i load this script on initial server run?


 
function Del()
 for k, v in pairs(ents.GetAll()) do 
  if v:GetName() == "gunshop_gunmaker_buttons" or v:GetName() == "gunshop_weaponmaker_blackpanel" or v:GetName() == "adminroombuttons" or v:GetName() == "furnaturestore_props" or v:GetName() == "furnaturestore_respawnbutton" or v:GetName() == "homedepot_counterdoor" or v:GetName() == "furnaturestore_respawnpncover" then 
 
  v:Remove() 
  end 
 end 
end 
hook.Add("PlayerInitialSpawn", "DTDel", Del)


It works fine. but it loads everytime when players initial spawn. so wastes resources
i wanna make it to initial server run once.

*it saved on lua/autorun/server