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I have an almost 2 degrees slope across the room, resulting in an almost 7cm height difference from one wall to the other in a room under 2m wide.
7cm in 2m... that's a crazy height difference, but when you stand back it looks straight (without the shelves) as everything was built by eye and everything also slopes accordingly.
It's only with shelves in there that it's obvious how sloped this part of the house is.
I installed mine using a spirit level and a few beer coasters under each foot until it was level… with the intention of removing the coasters when everything was level and drilled and replacing with something else.
so far the coasters are still there