Crates are a good option if you need to move flowers (ie you're moving) or you want flexibility in placing them in the sun/shade/bringing them in at night. Although there's only so many crates one can cart back and forth, I think this can still be a realistic solution for a grower looking to grow a couple hundred buds.
In this video, I talk about my experience growing ranunculus in crates but also my plan for next year.