TL;DR
Parameterized blueprints that have relative/grid alignment enabled should snap.

What?
When a parameterized blueprint is put down the parameter dialogue pops up but this cancels placing further blueprints if you were holding down the place button and intended to drag the blueprint and snap ...

The FAQ link in the upper orange bar of the forums leads to a 404 page.
help/faq
I noticed this while trying to find any site wide rules about etiquette for bumping threads (if that's even allowed)