The best and recommended structure for solar panels installation is Metal Roofing in which the solar panels get installed on iron pipe structure which is also known as high rise structure.
Usually solar panel installers use L2, L3 or L4 structures to install solar panels in Pakistan. Which is cheap solution but there are so many disadvantages of such structure and L2,L3 or L4 structures cant survive during thunder storms.
So instead of wasting your investment on weak structure invest once on solid metal structure to save your investment and solar panels from winds threat.