Erosion blanket over existing grass

[TonyPrin]

We have 20 linear feet along our driveway that slopes away 2:1 or a little steeper. The total area is approx. 180 square feet. We were able to grow grass last year, but we're concerned erosion is starting to get a foothold this spring. My plan is to put down an open weave jute or coconut blanket to protect the area, then overseed. The manufacturer says it can be placed over an existing lawn but I'm wondering what others think. BTW, because of the slope I don't mow the area.