I am planning on putting a engineered floating hardwood floor in my family room which has a cement floor (ground level). I have baseboard hot water heat on three walls. Do I need to install transition pieces under the baseboard heat or can I leave it unfinished since it is out of sight? The wall that is parallel to the boards is 24 feet in length. The walls that are perpendicular to the boards are 11 feet.

Transition pieces are used to make an smooth transition between different materials and to hide mistakes or expansions gaps. You have baseboard heaters to cover your expansion gaps. No transition needed.