https://wccftech.com/asus-shows-off-the-rog-bezel-free-kit-for-a-bezel-less-multi-monitor-experience/

The ASUS ROG Bezel-Free Kit is a universal monitor design that is compatible with flat monitors under 27 inches with a four-sided frameless or slim-bezel design. The Optical micro-structures refract light, bending it inward to hide the bezel underneath. This kit is an accessory that enables gamers with multiple-monitor setups to eliminate gaps where the displays connect, allowing users to create the appearance of one extra-large wraparound monitor for immersive gameplay experience.

The ROG Bezel-Free Kit is easy to install, the custom clips hold the monitors together at the top and bottom of each seam, aligning them at the correct angle. The kit is just three parts per seem, the two clips and lens that sits between them. This kit works with flat monitors under 27 inches with a four-sided frameless or slim-bezel design; each monitor's bezel width cannot exceed 13 mm. The monitor's positions may need to be adjusted for your normal viewing distance and position to achieve the best possible visual performance. Sadly, this Bezel-Free kit is not designed for general computing tasks, like web browsing, but is specifically designed to increase the immersion during gaming.