Bike Carrier for Caravan

Eyup everyone~~I'm looking for a suitable carrier (for Caravan) to carry (usually) one bike.

I quite fancied the "Fiamma" one which attatches to the "A" frame,but it seems like you have to take the top plastic shrouding off to fit carrier which will make the "A" frame look really untidy.

The other alternative is the "Fiamma" one which fit's on rear of Caravan but not sure about where to fit to make it solid as my top rail (above window) isn't slotted like the side awning rail.

Any help would be appreciated~Regards Ray.