on the floor:P

Whole front:
i use the k frame @ the dogbone mount to jack up the front, (after i drive it up on boards, to get a jack under the pinch weld, to get a jack under the car to reach the kframe) then i put the jack stands on the k frame near the front on the control arm.

Whole rear:
center of the rear beam. (i only need to put it on boards for the back) put the jack stands on the frame mounted side of the pivot bushing

i've never jack up just a side.. but if one front wheel, i use the k frame from behind the wheel to @ the rear control arm mount..