I did it the way the manual suggests, over the middle of the headrest. It’s been in there for a month or so. Even if the headrest doesn’t ever quite recover, it’s much more important to me that the child seat is installed for maximum child safety. That’s from a guy who babies his car, tries not to drive it in bad weather, parks way out to avoid door dings, loves the leather, and keeps it looking new. Still there’s no comparison, I’ll swap any amount of deformed headrest for even slightly better protection of that all important child.