I don't think foxes typically go for cats around here, and, as far as I'm aware, not much eats them either. We don't have any of the larger predators that might kill them just to remove competition either, so I suppose foxes are apex predators here too.

On the other hand, I can see either a cat or a fox being a tasty morsel for a bear, so tge whole apex/meso distinction is certainly location dependent.