I have tried alignment templates in the past, and always ended up “doubting” whether the line was correct. The Eyeline Impact Ball Liner is far superior. The notch on top really helps with getting the line truly set. The face alignment also helps with confidence over the putt.
This came free with another purchase I made with Eyeline Golf and at first I thought it was kind of a gimmick (not going to lie)… I tried it out and it CHANGED MY PUTTING! Trust the line, not your brain!