Seems that most people can't find a good camping spot for this map and just resort to zerk kiting. We did just fine holding right near the spawn area:
Killing Floor: 6 Player HOE KF-HillbillyHorror Waves 9,10+Pat - YouTube
Killing Floor: 6 Player HOE KF-HillbillyHorror Waves 9,10+Pat - YouTube