Based on this product's specifications, here are some alternatives and similar models
Plaster box for shower head GROHE 26483000 — recessed installation housing for concealed shower fittings
Summary description:
GROHE plaster box 26483000 is a recessed installation housing designed for concealed shower head fittings. It provides a mounting cavity for in-wall installation of shower connections and helps secure plumbing fixtures during rough-in. Suitable for professional and DIY bathroom installations where concealed, flush-mounted shower hardware is required.