My guess would be on the floor. :0
Ok, nuff kidding. Look under the car and you should see a couple of slots in the frame just in front of the rear wheels and behind the front. Those should help 'hold' the rig while you jack it up. If you 'really' want to jack it up and be safe place them under the suspension arms just under the bolts. It's a little harder to reach this area and still use the jack so caution is advised.