Based on this product's specifications, here are some alternatives and similar models
Wall plate B-Tech SYSTEM X BT8380-JPK/B
Summary description:
The B-Tech SYSTEM X Joining Plate Kit is designed for mounting the BT8390 to the BT8380. Made from durable steel, this black wall plate measures 140.8 mm in width, 57 mm in depth, and 158 mm in height. It comes in a pack of 1 piece, ensuring a reliable and sturdy installation for your mounting needs.