I jacked Mo up from the front jacking point once. The undertray was removed.
She slipped off the jack and put a nice V shaped tuck into the radiator, which then lost all coolant.
Replacing the radiator is a much longer story
Nowadays I jack up from the sides and put two pairs of bricks under the wheels. Then I jack up further and put axle stands under the sill jacking points.
I've seen Trikey puts axle stands in the same place. Make sure everything is level though.
For changing wheels I use the scissor jack. I have one from Tset (416) and one each for Mo and Kim.
I have one good set of wheels so have to swap them over regularly depending on which car I'm using.
Two sets of low profile tyres that never, ever stay inflated, so it's the high walled tyres I use.
And so to wheel bolts.
There is always one that refuses to shift. I now use a Millwauki to take them off.