When you want to put artificial grass on the soil; you try to put small white rock layer on the soil.
1 inch from the soil dirt.

the uneven you need to remove the uneven dirt...the small white rock will auto flat become .

no sunlight..and hight humidty, not a agood condition to grow any grass. Except the artifical grass low quality and tear off allow sunlight then is different story- weed can grow.
You go puchong IOI Galeria - they also put artifical grass on soil.