If memory serves me right then it was CES 2018 when ASUS announced a bezel kit for their monitors to expand towards a better surround-view experience. Basically you can take three displays and transform it into one. Two years later, it is available. 

Well, it is finally available it seems, albeit it is unclear as to why and that took this long. The kit contains two clips to attach to the monitors. The material will redirect the light rays so that the screen edges become invisible. According to ASUS something that works best at an angle of 130 degrees.

If you opt this solution then 27" is the maximum display size you can use with a bezel no wider than 13mm in the US it is sold for $110 on Amazon.

ASUS brings its ROG Bezel-Free kit to market