I want to install a stainless steel shelf outside the balcony to put flowers, which is unsafe. What should I do?

supplement

Balcony, also known as terrace and balcony, is a platform protruding from the external wall of the building, supported by columns or supports, and its edge is built with railings to prevent objects and people from falling off the platform, which is an extension of the building. Although balconies and balconies generally refer to the same kind of buildings, there are still some differences between them. A platform without a roof or cover is called a terrace, and a platform with a cover is called a balcony. There are generally three kinds of balconies: cantilever, embedded and corner. Balcony is not only a place for residents to receive light, absorb fresh air, exercise outdoors, watch and enjoy cool and dry clothes. If well arranged, it can also become a pleasant small garden, so that people can enjoy the cutest colors in nature and breathe the fresh and fragrant air without leaving home.