Yes, in all potential situations we always recommend an expansion joint of 5 mm on all sides so that your floor can expand and shrink as the temperature changes. If you respect the 5 mm expansion joint, you can lay the floor over a 20 m x 20 m area without profiles, provided that the difference in temperature between rooms is not significant.
Never fill the expansion joint with (flexible) silicone. Use our accompanying skirtings and profiles to finish the room neatly.