According to the specifications on
ASUS ROG Swift XG258Q (25", 1920 x 1080 Pixels), this monitor supports a VESA wall mount, so in principle it should be able to be attached to this stand.
However, depending on the viewing distance and purpose, the screen area might be too small. I use the stand for sim racing with a 40" TV directly behind the steering wheel, and I feel that this is rather the lower limit.
