I'm planting such cormlets in same way as full size corms. Depends how you are growing - in garden or in pots. I'm not more growing crocuses in garden to avoid rodent damage. I would place such cormlets on layer of coarse sand in pot and would cover with around 5-6 cm soil mix. Do it now, don't wait autumn but keep till September dry and start watering at normal time.
Janis