Best place to utilize the jack

for OP, it was good that you knew that that was not the correct place to position the jack, but it's not just for aesthetic reasons you don't jack on the rocker pinch welds. If you look closely there are bumps stamped in the sheet metal pinch weld "halves". They are deliberately made that way to allow moisture to drain out of the rockers, so water doesn't collect and rust the rockers out. And the rockers are an important frame component, whose strength is vital to support the car. So you don't want to do anything that would compromise the designed in integrity of the uni body frame.