Based on this product's specifications, here are some alternatives and similar models
Mocco tempered glass screen protector for Samsung Galaxy S21 — flat, scratch-resistant, model MO-TG-SA-S21
Summary description:
Tempered glass screen protector designed by Mocco for the Samsung Galaxy S21 (model MO-TG-SA-S21). The protector is flat (not curved) and provides scratch resistance and surface protection for the device display while preserving touch sensitivity and clarity. Intended for everyday protection against scratches, minor impacts and dirt. Easy to apply and suitable for users who want a clear, robust protective layer without edge curvature.