I’ve had two AF 1140DBs with 400 watts of panels on each. Use double sided sticky tape to set your brackets at their locations with two pan head 1x10 SS screws in each bracket. Installation is fine anywhere on the roof, just keep in mind a walking/access path during install.
Put self leveling Dicor around all brackets and screws and you’ll be fine. All my panels and components were purchased thru AM Solar (this is how they install them)…..I’ve never had a problem or a leak anywhere due to my installs.
Good luck! Rick