you need to decide which is more important for you. 144Hz or IPS.
I would recommend IPS for triple display setup because of the viewing angles, maybe something like this: https://www.amazon.co.uk/LG-23MP68VQ-23-Inch-Class-Monitor/dp/B01F1PSHVW.
but since you went nVidia you would be stock with 144Hz TN ASUS PG248Q. (quite pricey for triple-setup)