Take a few more minutes to check their security. If your item is a small item then placement in an enclosed cabinet may be best. Be cautious that another valuable item, such as a standing plate behind a valuable object is properly secured. Position items so they can be easily removed. Mirrored shelving and mirrored linings in cabinets are deceiving.
Breakage can easily happen by misjudging the perception depth.
Have delicate items such as plates and figurines secured with museum wax. Museum wax is a medium that is clear and will not harm the finish of an item. It has a stickiness that will hold an item in place. A particular brand name is Crystalline Clear, Museum Wax. It is specifically marketed for anchoring collectibles and Artifacts.