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Had a moment after hanging the fridge (next to the kitchen window), wife comes in and says the fridge isn't vertical. I've measured the mounting rail prior to hanging and the fridge itself after mounting and assure her it is. Only to find that of course, the window itself isn't completely straight. We've got a long kitchen with 2 roughly equal sized worktops going down either end. The floor isn't completely flat so where the worktops reach the end (again, with some excellently placed windows to show the unevenness), one is pretty much bang on the window sill, one a few cm below.
No intentions to fit the kitchen wonkily to offset the inherent wonkiness of the house (this may be where professional fitters are beneficial mind you).
I recently fitted half a kitchen (the bit without appliances) and it involved a lot of cursing from me. Floor and wall not being level made it hard work.