Based on this product's specifications, here are some alternatives and similar models
Rack base Rittal 2865.000 — stainless steel rack base for server and network cabinets
Summary description:
Rittal 2865.000 is a stainless steel rack base designed for server and network cabinets. Constructed from corrosion-resistant stainless steel, this rack base provides a stable foundation for enclosure installations. Supplied as a single unit, it’s intended for professional IT and industrial environments where durable, load-bearing support and long-term corrosion resistance are required.