Your 300 is 150 at a reception + 150 per return, a purely marketing figure. So you shouldn’t believe the bright inscriptions on the boxes, plus these are measurements in ideal conditions, but in real life we ​​have interference from our neighbors, the wifi environment is common, and even though there are 13 channels available, they are usually filled with neighboring routers in apartment buildings. If on cable 87, then on wifi it will be more.