I applied a Cinder 6 Plus to my 6S Plus and it fit perfectly. Took a couple of tries, but I got all the bubbles out and for the first time in ages, no dust! I love it. It is like the native screen. So nice to swipe from the edge and feel the smooth curve.
Maybe there is some variation, but I have not personally seen it.
This issue is more related to 6s, not 6s+. There are a bunch of threads across multiple websites that link the issue from the 6 to 6s.
Additionally, the Cinder is an edge-to-edge screen protector. This halo issue is not relevant to the edge-to-edge but to the full case friendly screen protectors, those that cover only the screen.