A foot is rather shallow, which is good considering you have only two bulbs. If the anemone is basically right under the bulbs, that would be good.
BTW, I asked Phender (one of the RC anemone experts) his thoughts on which species, malu or crispa, your anemone is. He is leaning toward crispa. In terms of what you provide the species, both are quite similar. Malus tend to be more sand/rock dwellers; whereas, crispas can be found in similar habitats, but seem to lean more toward rock. And, as I mentioned before, malus stay smallish where crispas can get rather largish.