LCD Overdrive in Acer Predator Sense can improve your response time, and you can enable it from settings with these steps.
The Acer Predator X27 looks much like Acer's cheaper Nitro monitors from the back ... running "Three Kingdoms" in 4K with Ultra settings resulted in an average of around 21 fps.
The Acer Predator X45 clearly wants to be one of the best gaming monitors, and one of the best ultrawide monitors, and indeed one of the best monitors full stop – no matter what you want to do ...