[TS]

You don't have to. Just poke a small hole on the media with a tooth pick, avoid perlite on top or maybe pick up and move aside, insert the root in that small hole and cover back with (damp) peat, make sure to cover the entire part of root with peat, you must be very gentle when you do this.
One more thing I forgot to tell, about 'when to transfer the plantlet', wait till the first two leaves to fully open before you transfer it. Don't use tweezers to pick up the plantlets, you may just damage them because they are too fragile, a toothpick is good enough.
Happy growing!