John,
I mount them like a normal tool, say a boring bar, but one edge of the router bit being used as the profile tool.
They work very well on brass because of the zero top rake, but I have yet to try them on aluminium. I am expecting a bit of trouble there, with the ali shavings bonding to the cutting edge rather than peeling off as would happen with a top raked tool.
Maybe your idea of rotating the tool might go part way to solving the problem, it does on the mill.
Bogs