I have decided not to put a front plate on my GT3 ($75 parking ticket if caught, but I don't park on the street anyway).  Other than parking, no legal problem.  But if I had to use a plate, I'd probably use this mount that threads into the tow hook location:

http://www.usmillworks.com/porsche_front_license_plate_mount_bracket_tow_hook.html


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18 GT3 Manual, 73 Carrera RS 2.7 Carbon Fiber replica (1,890 lbs), 06 EVO9 with track mods. Former: 16 Cayman GT4, 73 911S, Two 951S's, 996 C2, 993 C2, 98 Ferrari 550, 79 635CSi