Based on this product's specifications, here are some alternatives and similar models
Interface Card Synology M2D20
Summary description:
The Synology M2D20 is an internal PCIe interface card designed for expanding storage capabilities. It features a full-height/low-profile form factor, measuring 181.9 mm in width, 15.8 mm in depth, and 71.8 mm in height. This card supports PCIe output interfaces, allowing for high-speed data transfer and enhanced performance for your Synology NAS system. Ideal for users looking to upgrade their storage solutions.