I roll the topsoil a couple times then fluff it with a 36" rake before the sod is put on. A lot of people roll the grass after, but all that ever does for me is put ruts in the dirt. Be sure not to paint yourself in a corner when installing so you don't end up having to walk on the lawn. Try your best not to step on the lawn for 5-6 weeks (or until the grass doesn't mush down when you step on it). Also be sure to take an extra couple hours with the grading. You want to take out any dips and Swales in the yard. Grade, then roll, step back and get down low to look at the level of the ground. If you see an area (say 10'x10') that isn't PERFECTLY laser level with the rest of the lawn... Fix it... It's a nightmare to do bc by this time you will be sore and ready to throw on the grass and be done with it, but it makes a huge difference when reel mowing. Rolls of sod are much easier to install, just be sure to not run over the previous strip of grass with the machine tracks. If you use cut pieces make sure you push the pieces together tightly and secure them with lawn staples.
^thats the very OCD way to get a perfect lawn
I only cut my lawn every 5-7 days with a tru-cut. It's cut at 3\4" and looks incredible.
Make hay while the sun shines!