Based on this product's specifications, here are some alternatives and similar models
Socket outlet frame berker WNA403 for 3-gang installation, compatible with Hager WNA403
Summary description:
berker WNA403 socket-outlet frame (Hager WNA403) designed for 3-gang installations. Supplied as a single unit, this mounting/frame component fits standard 3-module configurations and is intended for organizing and securing socket outlets or switch modules. Useful for electrical installations where a coordinated frame is required.