Cup racer spolier fitment

For any one with a cup racer spolier, not the road version. How did you mount it? Any pictures from the inside of the tailgate see to see how yours secured it?
 
5D1B0675-5624-43BE-99DF-3A127625B155.jpeg I have one on my car , fully Re- painted with carbon dipped ends and hand painted Renault sport under neath bottom spoiler
 
Very rare I bought mine off a cup race car that was being broken, mine is only one I seen for sale in 3 years I been looking in for sale section on site..... cost fortune to get to that standard