At the front,
Put the jack under the suspension lower arm, as close to the ball joint as you can get.
Alternatively, jack under the rubber pads and put the stands under the reinforced section of the main chassis member which is slightly to the front of the jacking point and inboard.
At the rear, jack under one of the subrame mountings
'08 Chrysler 300CRD (MB OM 642 engine)
'95 E220 estate
'89 230TE (R.I.P.)