The toolbox fell over because it didn't have a solid footing on the bench.
Merriam-Webster has the definitions
- a stable position or placing of the feet
- a surface or its condition with respect to one walking or running on it
But neither really clarifies whether it can only be applied to living things.
Is there more leeway for objects that have feet of sorts, like a chair, or can I claim poetic license in stretching the definition?