Tomato 4-corner pinning, "2d track to empty" then latest steps?

Whats the latest step after “2d track to empty”?
I can’t get the auto-created empties to align with the background.
I’ve watched the tut by sebastian, but the software has been updated since then.
Please help! I’ve fallen and I can’t get it up!

Check your render resolution is the same as the video.

The camera aspect ration is linked to this.

Having incorrect rendering size will cause the misalignment.

Does that mean that the empty movement is linked to the camera view?