I can't tell you how many of my friends store their slow cookers on top of their upper cabinets. Sure, that space between the top of the cabinets and the ceiling would otherwise go wasted, but I can't figure out why people think that is the place for a heavy and cumbersome electronic appliance.
I get that maybe these folks don't use their slow cooker every day, or even every week, so it might not make the most sense to let it take up valuable real estate on the counter.
But there's a better home for it!
My Favorite Place to Store My Slow Cooker — Organizing Tips from The Kitchn