I have a cardboard box that has short sides. Something like a case of soda comes in: the sides of the box are maybe 3" tall. I put my cases in that box, I never counted but 50 or so cases fit easily. I then spray the cases with a good coat of One Shot. I then shake the box around which obviously turns the cases over and mixes them up while also distributing the lube to some degree. I then spray them again.
I imagine that I am getting a certain amount of the lube inside the case necks, but I am not doing anything special to ensure that.
I have done it enough to know how much lube I need. If the press isn't smooth when I am sizing, I might shake and spray again.
I have had very good luck with this method. I have used other spray lubes and had problems but One Shot works great for me. I have tried Imperial Sizing lube and have some at the bench but it doesn't work as well for me. I tried the lube pad years ago and it was a PITA as far as I am concerned. I have actually run out of One Shot and simply stopped loading until I got more even though I had several other methods of lubing cases, that is how much I enjoy using One Shot.
FWIW: I size my cases, then tumble them again to get the sizing lube off the cases. I am not sure if this is nessessary, it is just what makes me feel good. Again FWIW: I use reloading as sort of a leisure activity. I try to go into the gun room when I have some time, put on some music or a sporting event on the radio, and do some reloading process. I am very seldom actually loading complete cartridges from start to finish. I might size and deprime 500 cases and put them in a container. Then I might trim all 500 cases and put them in gallon Ziplock bags. These proceses might take weeks to accomplish in my spare time. If I actually need ammo, I can take out as many cases as I want, prime, powder, bullet and I am done. This is an on-going thing that I spend some time with several nights a week. I have thousands upon thousands of partially processed cases on the shelf. This of course only applies to rifle cartridges. Pistol stuff I load on a progressive, so I am just churning out loaded ammo. But again, I usually load 1000 or more rounds at a time in a given caliber when I do it.