Does water drain evenly if I put it as a rug over concrete?
The water won’t drain well when you install turf on a perfect flat concrete surface. Water will drain sideways if your concrete surface have a slope, if not, you might consider using some drain board underneath your turf to create room for water to flow. In certain cases as that the area is small as you mentioned “rug”, your turf will drain just as well as the concrete surface itself. For any further questions, please feel free to email us at support@megagrass.com, thank you.
I did a similar install over concrete and had to make sure there was a good drain layer underneath. Cutting small channels in the concrete helped a lot. Also, when prepping the surface, I was looking up where to buy concrete release agent https://globmarble.com/decorative-concretes/concrete-release-agent-en/ to keep things from sticking during the process—came in handy when removing temporary forms I used to shape the area.