center line of roof and center line of top marked with pencil.
My method, glue and luck.
a narrow strip sprayed down both center lines to place the top correctly and start working outwards. The 2 little cross marks come together to locate front to back, the long line is for side to side.
center line is glued, I worked my way out towards a drip rail about 8" at a time. A band of glue on the roof and on the vinyl.