Hi, welcome good luck in your search, just remember that every RCZ is a fantastic looking thing, even the ones with a few issues, so don’t be persuaded to buy the first one you see, as they will all have massive kerb appeal.
As for the jacking points, once you have your beautiful Z, avoid them like a cop with a speedgun !! They bend easier than a ballet dancer on valium
You can use the adapter but I would still go for the cross members instead of the jacking points. They really aren’t suited for purpose.
I have always used the side, just behind the front wheel or in front of the rear wheel. It is tight, but I have a low profile trolley jack. You can also drive the car onto a block so there is easier clearance. I do use a flat piece of wood also to protect the metal.
The suspension on the Z is such that if you so desire you can lift both wheels on the same side, but I’m not too sure how advisable that is.