The front of the runners have this nice straight line that looks nice.
The back of the binding also looks nice too.
And the trick is this little baby. I have a Bernina and this #10 foot labeled edge stitcher works great. I just run that middle blade down the ditch on the front of the runner and move my needle over two or three clicks. I pin my bindings down from the front and within just 5 minutes I and done. I do know that the feet are called several different names. There are feet called Overcast or Blindstitch that are very similar and can be used. My Janome didn't have one so I was able to find one on Madam Sew on the internet. They have every foot you could want and more and adapters that fit most machines.
Now I know that binding this way is not the thing for a nice quilt, but for runners and placemats that get washed a good deal it does work well.
For those fans of my daughters peacocks. This is a picture of her front porch and notice the peacocks that seem to think they are gargoyles. My other daughter arrived at the house and couldn't help but laugh at them and said they reminded her of gargoyles on ancient building in Europe, and snapped a photo of them.