Place it about 1mm below
Place it about 1mm below the top frame (where part of the frame where the webcam is located). The first time I tried placing the screen protector, I placed it right on the edge of the frame and by the time I got to the other end, it started going over the laptop frame and not adhering well. So I had to discard that one. So glad the kit comes with two! Worked great the second time when I placed it slightly lower.
I also like putting screen protectors on in a slightly humid bathroom (just let the hot shower run for a bit) because the humidity makes a lot of the larger particles floating around in the air fall to the ground. So you get less particles trapped between your screen and the protector this way.
Overall, I love the matte feel so much more than the original screen! Works great on my Lenovo 16abr8.