I have 12 of these storage “cubes”. They are not very sturdy - the round connectors are hard to put on and can easily come off. It is a tight fit for the shelf edges to go into the cross-shaped slots, and they don’t really fit in all the way which makes them wobbly. The cubes are okay to use for stuff you don’t have to get at often, due to just touching them can make the connectors slide around and then a shelf or the side comes loose. I had to hold some of the corner areas together with zip ties. (Some newly ordered shelving is on it’s way anf these are out…).
So if the your stuff is lightweight and not often used, they could work out fine.