Under the sump. (Only joking)
ZR is the same front end as early 200 and 25 so I put the jack under the front cross member. Big black thick metal piece that goes from one side to the other, has two bolts at either end.
Ooh, front or back?
Back;
Put under the cross bar that the trailing arms attach to. Preferbly where the arm pivots. Not too sure as my 200 has the same suspension as the 45/ZS at the rear.