mounting help

How do I install the m.2 SSD over the thing? read below. I have a Z370 D3H rev 1 and I'll get a SSD, and it'll be 80mm, now I've checked my mobo and a weird thing is sticking out of the 80mm hole. And the screw is over that, ik there should be a thing under the screw but I can't manage to...

I want a new monitor and i want a biggish one but the one I'm looking at is 27" but is only 1080p and i wanted to know if their would be any stretching or pixelation? if so should i settle for the smaller 23.5" 1080p