I've just bought a Rezaw-Plast one that came from the Roof Box company, seems pretty decent quality. They do various different makes but the annoying thing is that there are different ones for the when the boot floor is in upper or
lower position. I've gone for the lowered floor as it seems it will in that position most often, it fits up to the bottom of the slope at base of the rear seats.
I had a Calix one in my old 5 door hatch and it has done a great job over 4 years of use.