Assalamu Alaikum wa Rahmatullahi wa Barakatuhu There is nothing wrong with a distance of 120 centimeter between the place of each worshipper and other worshippers in the same line, and also between the place of prostration of a person and the place of prostration of the other person who stands in front of him/her, but if the distance is, for example, two meters, the validity to follow is the place of the problem