phew! thanks for that, i presumed the back box sat square on the car so was starting to wonder
I am certainly not saying it will sit perfectly once fitted, just that it does sit at an angle. Mine currently sits with the tail on the left (as your looking at the rear) pointing slightly back into the centre and ever so slightly lower than the one on the right. I don't think only having the one hanger helps as this will always mean the right tailpipe sits slightly higher than the left.
This picture shows you how mine sit, going to have it sorted soon though.