I don't know where is the best place to plant cauliflower.
Where Is the Best Place to Plant a Cauliflower
Certified GKH Gardening Expert
They grow best in sun but tolerate some shade, especially in warmer climates. Also, be sure to mulch them good to keep the soil cool for optimal growth. This article will help you with growing cauliflower: https://www.gardeningknowhow.com/edible/vegetables/cauliflower/growing-cauliflower.htm