Based on this product's specifications, here are some alternatives and similar models
Synology E10G30-T2 Dual-port 10GbE 10GBASE-T Network Interface Card, PCIe 3.0 x8
Summary description:
The Synology E10G30-T2 is a high-performance dual-port 10GbE 10GBASE-T add-in card designed to boost network bandwidth for compatible Synology NAS systems. Featuring a PCIe 3.0 x8 host interface, this network adapter provides reliable, high-speed connectivity for demanding data environments. It is an ideal solution for users looking to upgrade their storage infrastructure for faster data transfers and improved network efficiency.