A plus for you is no stress on the glues or ribbon at the hinge side. It does not take much to over extend a full 90 degree open.
I tend to open mine just enough (about 45 degree) that it does not reclose on itβs own, just for that reason.
You have a shelf above? Might think a hookish thing from above might work also.
I too keep mine at the smallest angle it would support itself. Cute name BTW,