I installed the sto n sho available for a Mach e BUT a Rally has more clearance; not sure I would do this on a GT...i have knocked my plate a couple times where before the Rally well cleared the curbs...anyway if you go the sto n sho, I will recommend a better adhesive tape or exterior Velcro...
BDR routes have options...
https://www.google.com/url?sa=t&source=web&rct=j&opi=89978449&url=https://ridebdr.com/&ved=2ahUKEwipvvS8iOCMAxWCEFkFHYsmKisQFnoECAwQAQ&usg=AOvVaw1_w4WC-D2dbaF8oTWmKjAE
Saw three at dealers in my area in Maryland when looking to buy mine end of Jan 2025, not seen another on the road yet in my travels of 4k miles ...but I have seen and blown the doors off a few ice mustang GTs ?