The number of ceramic mosaic display racks to be placed in an exhibition hall depends on several factors, including the size of the exhibition space, the quantity of mosaic tiles to be displayed, the layout of the hall, and the overall design objectives. Here are some considerations to help determine the appropriate number of display racks:

1. **Exhibition Space Size:** Evaluate the size of the exhibition hall to determine how many display racks can comfortably fit within the space without overcrowding. Consider factors such as aisle width, booth size, and available floor space when determining the placement of display racks.

2. **Quantity of Mosaic Tiles:** Consider the quantity of mosaic tiles to be displayed and the variety of designs, colors, and sizes available. Ensure that there are enough display racks to accommodate the entire range of mosaic tiles effectively without overcrowding or limiting visibility.

3. **Layout and Design Objectives:** Determine the layout and design objectives of the exhibition hall, including the flow of traffic, focal points, and areas of interest. Strategically place display racks throughout the hall to create visual interest and guide attendees through the space.

4. **Accessibility and Visibility:** Ensure that display racks are positioned in prominent locations where they are easily accessible and visible to attendees. Avoid placing racks in areas with limited foot traffic or obstructed views, as this may hinder the effectiveness of the display.

5. **Variety and Organization:** Group similar mosaic tiles together on display racks to create cohesive and organized presentations. Consider organizing racks by color, style, or theme to make it easier for attendees to browse and compare different options.

6. **Brand Representation:** Incorporate branding elements such as logos, colors, and graphics into the display racks to reinforce brand identity and create a cohesive brand experience for attendees.

Ultimately, the appropriate number of ceramic mosaic display racks to be placed in an exhibition hall will vary depending on the specific requirements and objectives of the event. It's essential to carefully assess the exhibition space, consider the quantity and variety of mosaic tiles, and strategically plan the layout to create an engaging and effective display that showcases the tiles to their full potential.