Mine can.
What you are looking for is called "lay down mode". By lay down, they mean the laser can be set on its side. I did 660 feet of fence awhile back over slightly rolling terrain. Set the laser on the highest spot, and the laser sweeps around so it can hit the low spots. If the terrain is level or straight there is also a spot mode, but this is much harder since you have to find that one spot. The lay down mode is better since it sweeps and can cover from the bottom to the top of the post.