What if outdoor clothes racks are not allowed to be installed?

There is no way. It is illegal to install clothes hangers outside the house. According to Article 39 of China's Measures for the Administration of Interior Decoration of Residential Buildings, "without the approval of the competent department of urban planning administration, if buildings and structures are built in the interior decoration of residential buildings, or the facade of residential buildings is changed without authorization, doors and windows are opened on the non-load-bearing exterior walls, the competent department of urban planning administration will be punished in accordance with the provisions of the Urban Planning Law and relevant laws and regulations.