At first I was thinking about something like William's used in Funhouse behind the mirror to eliminate ball trapping. A piece of plastic angled with two plastic stand offs and anchored by a post nut but I dont think there would be enough post thread to use this type of setup. Have you contacted Cliffy? He's awesome at fabbing stuff up not to mention with the product being thin you could use the VUK ramp nut to lock it down in addition to his 3m adhesive. Not to mention this would take the customer all of 1 minute to install.