Bike rack for Insignia

Hi, I have 2010 Insignia Hatchback and a rear low mount 2 cycle bike rack (like http://www.halfords.com/webapp/wcs/stores/servlet/product_storeId_10001_catalogId_10151_productId_250983_langId_-1_categoryId_165477one). I'm having problems finding a suitable anchor point for the hook of the bottom left strap... the right one's fine - it goes on to the tow hook - but there's nothing suitable on the left. :?

Has anyone over come this problem? Or if you have an Insignia would you have a look at yours and see if you can see somewhere suitable?

I already have both the car and the rack (previously used fine on our old Passat) and am not a serious biker, just trying to be more active, so don't want to buy a new rack if I can help it.

Thanks in advance

Caz