I have a set of bypass closet doors and need to attach the little guide in the center to the floor. The floor is carpet and pad over concrete.

My basic idea is to attach a piece of 1/2" oak to the floor on top of the carpet by drilling holes through the carpet into the concrete with a hammer drill, drop in sleeves, then screw the oak and the guide to the concrete over the carpet all in one shot. This would require pretty precise alignment of the holes.

Another idea would be to make a couple holes in the concrete and screw the oak to the concrete floor first. Then I would make a separate set of screw holes in the oak for the guide. This would require less precision attaching the oak to the concrete, and allow easier alignment of the guide.

Make sense? Any suggestions?