Some advice on safety rear beam Axel positions

[mk2bal]

Stick your head under and have a butchers. Just dropped rear beam on mk3 and did mk2 a while back, but the sill is an area I definitely wouldn't use. I think in front of bumper bracket sounds about where I went, can't remember exactly what the underside looks like off the top of my head

[clipperjay]

Looked at the sill and not convienced the only place is the bumper but one issue the Magnex back box is in the way on the left    Looks like the jacking points are where there is a donut mound or reinforced section of steel.
I think If I can stick one on the right bumper and one on the left sill with wood the loads should be spread?
Good thing the tank is completely empty of fuel.