It does not stabilize well no matter how tight you screw the bolts. If someone sits and moves a little to the right or left, the lid comes off its position.
I don't know how it worked for others (apparently, it might be somewhat tricky to fit properly), unfortunately, I bought two for two toilets and it didn't work out.
I already replaced one with another lid and it is clearly better (at the same price, by the way). However, the toilet bowl also plays a role because it is more stable in one than in the other. In the one with a slightly greater curvature in the porcelain where the lid sits, it slips and comes off more easily. But if it had better construction, there wouldn't be an issue.