Based on this product's specifications, here are some alternatives and similar models
Atte buffer set for 17 IP cameras with IPUPS-17-11-H PoE switch (17P+1UP)
Summary description:
Buffer set by Atte designed for use with up to 17 IP cameras and the IPUPS-17-11-H PoE switch (17P+1UP). Provides power and network buffering solutions compatible with the specified switch configuration. Intended for surveillance installations requiring centralized PoE connectivity and stable power management to maintain camera operation and reduce downtime.