Based on this product's specifications, here are some alternatives and similar models
Desk Stand for Poly Edge E Expansion Module, HP POLY (pack of 5) — desk mount for Poly Edge E
Summary description:
Desk stand designed for the Poly Edge E expansion module, supplied by HP POLY in a pack of five. Intended as a desktop mounting solution compatible with Poly Edge E devices. Practical for office or contact-centre installations where stable desk placement of expansion modules is required. Package dimensions: 190 × 210 × 55 mm. Made in China.