The most important thing is to have the seedbed firm BEFORE spreading the teff.  

I planted an entire field of it last year.  The best establishment came from under tractor tires and where the spreader drove.   

Picture is of where I had to stop packing the field before it was spread. I was in a hurry to get it done since another rain was on the way.  It all eventually came in, but it was one rain event.  The angle going to the right is where I drove to the field driveway, the V in the middle wasn't packed before.
behind.