Thank you Pro and Frank. The GT Guys are getting the windshield for me. I asked them to see if it made sense to put the film on before installation. If the installers (glass specialists, not the GT Guys) use suction cups to handle the glass, it may not be a good idea.
film always after.... you dont want the film under the rubber gasket. if you ever remove the film when installed with the glass, it could cause a leak and destroy the gasket integrity