OK to use Preen or other trifluralin products on new bulbs?

I am planting about 1,000 bulbs in the next few weeks. I have an issue with WINTER weeds as much as spring, even with mulch.

Is it OK after planting and mulching to sprinkle some Preen/trifluralin over the mulched bed with newly planted bulbs?

It seems like the label says “established” bulbs, but since bulbs aren’t seeds, and trifluralin is a pre-emergent, I can’t imagine it would hurt them.