I rebuilt my front end last year and I placed my jack stands where your's are placed. I raised the car by jacking in the middle of the crossmember. Of course for that job I had the front end very high. I also placed jack stands under the jacking points on both sides behind the front wheel. The service manual shows the locations of those areas.
I too, still left the floor jack under the center of the crossmember until the job was finished.