Based on this product's specifications, here are some alternatives and similar models
Rack shelf StarTech CABSHELFV — 2U vented steel cantilever tray, 19" rack, 16" (406×483×88 mm), 23 kg capacity, black
Summary description:
2U vented rack shelf by StarTech (model CABSHELFV) — a universal cantilever tray for 19" network equipment racks and cabinets. Constructed from heavy‑duty steel with black finish, the shelf measures 406 mm wide × 483 mm deep × 88 mm high (16" deep) and supports up to 50 lb / 23 kg. Suitable for mounting switches, routers, small servers, UPS units and other IT devices needing a sturdy, ventilated support within standard 19" racks.