Greg,
Well, two mounting points, as one end is pretty firmly anchored to the header and this is--or at least ought to be!--pretty firmly mounted to the engine.
How firmly? Well, as an aside, at one time PW was installing his headers to engines with J-B Weld. I don't know if he still does this, but would not be surprised if this is still the case.
As per above, keep the silicone coupler short. While keeping the header long; any shortening of the assembly of pipe and header ought come from the pipe, as the aluminum header so much more readily shrugs off the high heat.
But don't make the installation one where the nose of the pipe rubs the end of the header.
I am planning on using a Dave Brown pipe mount, but concerns of abrading the CF pipe are valid. The use of a loop of silicone tubing sounds quite attractive and is something I will be considering.
Speaking of which, I notice folk using plain ol' rubber bands to hold their tanks in, these bands operating in close proximity to a hot header and plenty of fuel.
Don't do it. Create anchors of some sort, I use lengths of 4-40 Gold-N-Rod tubing to embed anchors in logical places, install formed hooks which are bent up from 4-40 threaded rod.
The retaining band itself is a loop of silicone fuel line--I like and use Prather's--the loop formed by insertion of a length of 4-40 threaded rod, each end of the tubing wrapped to this rod with serving wire.
Dan