I forgot... I would not use one. My concern would be flying metal from the safety device and, far worse, from a blade that failed. I'll stick to me old push-sticks.

Whenever I use a router, I place a 3/4" piece of oak plywood in my apron pouch and turn the apron 90 degrees.

Router, minds me of... I used to get a kick out of Nahhm on The Yankee Workshop : "And remember this, there is no more important... safety glasses." Then he would proceed to use every manner of shop equipment without ear protection. But what a workshop! Droool!