I am installing this same plank in my basement. I use a scrap 2x4 to evenly distribute the pressure from the mallet across the locking mechanism. They damage very easily.
no need for glue on this application. the floor looks pristine. there is absolutely no reason this floor would fail , so glue down is a waste of time and money. for the record , no manufacturer requires glue down installation on commercial jobs. They recommend it, but don't require it. it all depends on the condition of the sub floor and the use of space. Its discretionary to the installer. also the pattern here is horrible. you never install set size boards in a stair pattern . too much waste and it looks terrible. Thats a rush job . never go more than 2 rows ahead of the other guy. use your cuts to start the next row. virtually no waste.