3D PRINT SETTINGS:
All STL files are all already oriented properly.
No need for supports, or brim.

The hangers print on their side and don't need support, even for the overhanging part.

Layer height: 0.2mm/layer
Wall line count: 2
Infill: 15 to 20%
Build adhesion type: None
Supports: None

To mount the wall brackets and wooden rail:

• mark locations for the holes on your wall, every 40 to 50cm or so depending of the length of your wooden rail. So for a 1m or 40" rail you'd have 3 brackets. Leave about 5cm or 1.5" of wooden rail sticking out past the brackets at both extremities.
• drill holes in your walls at the right diameter for your anchors (diameter about Ø3/16" or Ø5mm, 30 to 40mm deep).
• place the inserts in the wall
• fix the "dovetail" pieces on the wall with the scews
• slide some wall brackets on the wooden rail
• then place the rail parallel to the walls and slide the brackets onto the dovetails. (or you could first put 1 bracket onto 1 dovetail, slide the wooden rail inside, and THEN put the additional 2 brackets on the rail and slide them onto the dovetails. Maybe easier that way...)