Furniture

Is there a bit of a lip on the leading edge of the shelf? might cause a dimple over time?

Depending on how full the shelf is you might run into issues with the ends - would only cover 2/3rds of the sleeve so might get excess pressure at the leading edge again. For what it's worth I store mine on the deepest vitsoe shelves and still worry about the ends not being quite tall enough to provide proper support unless the shelves are really full / self supporting

edit: all of the above based on the assumption you're talking about 12"lps rather than 7"45s