an inch of hang over on either side isn't going to cause you any issues but having that excess will save you in case the print decides to start creeping one way or the other
Oh bullcrap...an inch of lam WILL stick to the roller and if you're not careful, will roll itself up around the roller.
I wish they would make all laminates shy of the actual measurement. Like 54" laminate actually being 53.875" or something. I seem to always get laminate that's up to 1/4" wider than the vinyl. Always have to trim off the little edge.