The grocery that's most bikeable for me has this really bad wheel cradle style rack that's just bolted to the ground and made of thin metal, but its right outside the front glass of the liquor store, so there are always 2-3 people watching while they run the register. I always stop to chat so they'll remember me and my bike. At night, I skip it entirely and chain up to a beefy stairway handrail 30 feet away.
I know its accidental in this case, but putting a rack in a "monitored" location like that raises the security a ton in my opinion. I don't anticipate many folks breaking out a battery operated grinder right there, at least where I live. There is lower hanging fruit.