Question about ASUS USB-AC53 Nano

It depends on how far away you are from the router and what else is in between, such as a wall.
However, I would recommend something else, for example: ASUS USB-AC68 (USB 3.0, 1300Mbit/s, 600Mbit/s)

The stick would be enough for gaming, depending on what you are playing or how much traffic you have. That is, for most games it shouldn't be a problem, as they never need that much throughput, but if you are, for example, in several voice channels at the same time and also do Twitch or Xbox live streaming, you might run into trouble.