I made my own labby mounts with the Flex Mod mounted to the top. You do need to electrically isolate the mount. I changed out the heat sink that comes with the Flex Mod for a larger one since I'm running two diodes in parallel.
No Fins are required on the mount. The thermal load is easily distributed through the mount. I have run the diodes for many hours non-stop without a problem.
In most professional projectors the beams are 2" above the bread board. I made stand offs to rase my beam height since all of my mirror mounts and scanners were already 2".
Lazerjock