I've recently bought one of these for my laser I'd bin using a similar clamp thing with my old laser but I think my new later would be to heavy for itMy mate bought a cheap Bosch laser, which came with one of these:
http://www.screwfix.com/p/bosch-mm-02-professional-adjustable-clamp/3992k
I tried it with the Dewalt laser, just clamped onto an architrave, and it held it without any problems at all, I was really surprised at how good it was, so much so, that I am going to get one.