Hi Jeff, and welcome.
I regularly have to jack cars up, to remove the alloys (refurbishing them, not stealing them
I normally look for a solid chassis rail to place the jack under, or, if none is available, the main jacking points along the sill.
I then place the axle stands on a substantial beam very close to the hub (this places the car's weight where it would normally be, if sitting on its wheels).
If you wish to place the axle stands on these sill points, then you can use one jacking point to raise the entire side, which would allow an axle stand to be positioned at the end you will be working on, then repeat for the other side.
Be careful how high you lift however, as the axle stands will have less car to hold, and any camber may make the raised car unstable.
It is for these reasons, that I've never used that method myself - be careful indeed.