subframe connectors

Difference is minimal. You could make an argument that it's better to have it on the dollies because the weight is sprung normally, but I've seen it done both ways by professionals with no consequences. If you want to keep the weight sprung & have more working room, put the jack stands under the rear axle & strategically placed under the front frame near as you can to the LCAs. That should get the weight distributed closely enough.