Also, I assumed 40’ containers.
Too cute by half...Military containers are 20-footers. Sure, commercial containers also include 40-footers, but a row of 30 - 33 40-footers would stretch out to 1200 - 1320 feet or 400 - 440 yards. That's not the 50 yards X 100 yards that your original post indicated...but then again your latter contradicting assumptions are just too much. I'm most certainly glad I don't work for you and that you don't work for me.
No, put them the other way.
30 containers at 3 yards wide (9’ to allow clearance) are 90 yards. Three rows of 40’ will take up 120’ or 40 yards, fitting into the 50 yard width of the football field.