I recorded this more than 2 months ago and forgot about it, so here it is now :)
Best method to install any kind of accessory like this is to either attach directly to a stud, or have solid blocking behind the drywall to screw it onto. Next best is a toggle bolt, like I used here. Avoid using those crappy plastic expanding anchors that come with these or the screw in type, since they won't hold long term.

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