Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:4545736.
I wanted just single ones so I could place them as close or far apart as I wanted so I cut the original and then added two more holes for screws as a single hole would make a pivot point and might let the hanger move. I left the middle one just in case you wanted to use the single attachment like on a pegboard or something.
Print on the side so you need no supports. Should be oriented the right way in the STL file but you never know.
I printed mine in PLA since I still have not played around with PETG but I am thinking they should be fine but pick your material at your own discretion.
In Cura the time says 1hr31min and 15g of filament. I put 8 on and printed at once and it gave me 12hr28min and 118g, just to give you a GENERAL idea of time and materials.