Keppoch, Im a wood floor fitter and I lay this type of engineered boards regularly, the 18mm board fully stuck down would last a life time, the MDF backed boards are usually made to be floated over a DPM backed underlay. However as pointed out by others, you would 1st need to check moisture levels in the concrete sub floor and in the base of the walls where they meet the sub floor, the relative humidity of the room @ 20 degrees should be between 45% and 65%.
A liquid DPM such as Sika MB or Lecol sealer should be rollered out and left over night to dry, then use the addesive from the same manufacturer.
The boards with bevelled edges are usually pre sanded so would only need a light sanding after installation and the best lacquer for a hall would be Bona Traffic, comes in matt and satin finish too.
But to be honest here, the chap you have to fit this, should be telling you all of this if he has any idea what he is doing.
cheers
Mark