I lay all the cases out on an old rag and orient them with all the case mouths pointing the same way. Then I spray One-Shot from a 45 degree angle so I hit the body and down in the mouth as well. I get plenty on the shoulder. I then roll the cases over so the other side is up, and repeat.
...This. I find it's the most reliable method to ensure the cases and the neck interior are lightly coated. I line them all up laying down, so the neck is facing me. I use a very steep angle when spraying to ensure the necks get just the right amount.
By the way- I like to use RCBS Case Slick- the dilution medium contains Hexane which provides two benefits. One, the lanolin remains in suspension and does not settle out. Two, it evaporates quicker than alcohol. This generally results in just the correct thin coating of lubricant.