Should be fine if this (clicky) is the type of thing you mean, they are the same weight (approx) as an MP and most people with these units have 3 or 4 MPs per shelf. The Fantastic Furniture one is basically the same as the Ikea one so it should have the same tolerances (the picture on the website with the anime figurines in them seems to indicate this as well), but I don't have one so I couldn't say for 100% sorry.
Not sure honestly as the laws change from state to state, best bet is just ask for clarification from the police dept.