One option is to make a hole in the laminate that is larger than the screw or bolt that holds down the sofa. I didn't bother and have had good results. I figure the floor under the sofa will float to and from the bolts just as all of the exposed floor will move toward and from the sofa.
You really don't want a true floating floor- if you hit the brakes really hard it will all end up wadded in the front!
