I use straw erosion blankets after seeding grass mixed with something like Oats or Rye that comes quick. These blankets come 8'X 112' for 40-60$-worth every penny.
Netting is used and anything over 3 to 1 slope requires the double net. I use weed barrier fabric stakes to hold in place and water every day with trash pump set up for 3/4" discharge for garden hose.