This is a holder for rear speakers designed to mount on an Ikea Poäng chair. Due to the curved back of the chair, there are two versions of the holder, one left and one right, so you should print one of each. If your chair usually moves a lot, we recommend printing the clips as well. They ensure that the holder does not loosen over time.
Since there are many different speakers, there are no holes/mounting points. Use a drill in locations that fit your speaker and secure with a small screw. If you want to take the easy way out, velcro or double-sided tape works fine. You can also take a small wood screw and screw it through the bottom of the holder without drilling holes first.