Under the Rear Suspension Crossmember
WARNING: This page is about a different car, the 2009 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
The jack stands must not be placed under the (rear suspension crossmember) front reinforcement rib.
Position the jack stands as follows:
Spanning both of the (rear suspension crossmember) rear reinforcement ribs.