Every solar company - except Tesla - explained that the best way to install panels (for a customer who also wants to install a new flat roof) is to first tear off the old roof, then install the solar supports, then lastly install the new roof around the supports. Tesla explained they do not install this way, as they do not coordinate installation with roofers. They instructed me to have the new torch-down roof installed first, and then Tesla will penetrate the new roof with the solar supports. Does Tesla's method of installing solar after the flat roof is completed, significantly increase the risk of leakage? Most flat roofs have ponding, and I am concerned about leakage in the future. Thanks!