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The only thing I've ever seen really hold in well drywall are toggle-bolt anchors. These are the kind that have two spring-loaded "wings" that close to go through a hole, then spring open once all the way through the hole. Once the spring-loaded wings have flipped opened behind the drywall, the screw is tightened which pulls the wings into the drywall. The screw is passed through the item you're securing first, then into the toggle bolt before it is inserted into the wall.
I've had nothing but frustration with most of the other types of drywall "anchors" they sell, especially those cheap plastic inserts. Those plastic inserts work ok sometimes for holding things that aren't jostled, but they pull out when used for tp-holders, towel holders, etc... anything that gets pushed or pulled on.
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