Based on this product's specifications, here are some alternatives and similar models
Rack rail kit EQUIP (PowerWalker 10120531) for VFI 6000P/RT LCD & VFI 10000P/RT LCD — 550×70×140 mm, silver
Summary description:
Rack rail kit EQUIP (PowerWalker 10120531) is a silver mounting accessory designed for PowerWalker VFI 6000P/RT LCD and VFI 10000P/RT LCD UPS units. The kit includes left and right rack rails (two parts per side), M6×16 rack screws (12), nuts (4) and a washer plate. Dimensions: width 550 mm, depth 70 mm, height 140 mm. Used to secure UPS devices in 19" rack enclosures for stable installation and easy servicing.