Based on this product's specifications, here are some alternatives and similar models
Shelf SCHROFF UNI 600W 600D Model 21130323 — steel equipment shelf for 19" enclosures
Summary description:
SCHROFF UNI Model 21130323 is a steel shelf designed for equipment mounting in server and network 19" enclosures. Specified for 600 mm width and 600 mm depth, it provides a stable platform for non-rackmount devices, tools or accessories. The shelf suits IT cabinets and industrial racks, simplifying equipment organization, load distribution and maintenance access.