When I first changed from buying coffee already ground to grinding my own, I got a coffee grinder that was not electric. Having grown up where the electricity went off an average of ten times a year (from a few hours to a few days) I did not want to depend on it for anything as vital as coffee.
I never quite brought myself to screw it to the wall, even when the last two places I lived were houses that I owned, so I was restricted to positioning it on something it could clamp to.
It's very sturdy.
After about fifteen years of use, I moved into a kitchen where there was simply no place to put it that did not block access to a drawer or a cabinet. I had to get an electric one. However, I still keep the non-electric one where I can find it without hesitation in the dark.