Never got round to this on the old CX5, but I'd finally tried to fit my old Hollywood 4 bike rack to the new one. When I did, there was no way it would work (and I hated the damn thing anyway, it never felt stable). Then my son passed on a Thule one he'd picked up for his Corsa which he didn't need. At first try I wasn't hopeful, but then realised that the real problem was the top straps pulling down on the spoiler. A bit of bodgification with some triangular adaptor brackets and voila! High enough to be above the lights so no trailer board required, even the rear wiper can still be used.
FWIW, that's a Thule 9105 or 9106 (not sure which as I don't have any documents, I think one is a 2 bike, the other 3)
Alan