I have a trophy splitter on my F and agree with Mickle5 about stability.
Originally they are held on with 5mm thick double sided foam strip so I used this when I first fitted mine which was fine until I caught the pavement parking nose in first on our first day in Naples, the foam pulled off and wouldn't reattach properly, even when starting from scratch again. I resorted to sikaflex, equivalent to tiger seal but free I get it from work.
Home to black Alfa Romeo 159 3.2 V6 Q4 ,green MGF VVC and red MG Maestro T16.
MG - the friendly marque.