And after you get your hives perfectly level, you must make sure that they are in a straight row. Pull a string or use a transit. And if they are not painted white, well.................... :-D
It all matters to what makes you happy with your bees. I have had hives so far out of whack, you would think that they would have fallen over, but the bees never complained to me about them. I think they are happy just to have a roof over their heads.