closet door brackets

Hi, I put in a new laminate floor, and realize that I wasn't there when somebody yanked out the brackets that appear to anchor the swinging bi-fold closet doors (you know, four panes, two on each side, each side has a jointed break in them).

My question is - since this is a laminate (floating) floor, can I/should I avoid screwing these into the floor?

Visual inspection seems to indicate they were screwed into the wall and the floor when this was carpet.

Thanks in advance for any tips!