The attachment point does make a difference. Having the attachment on the front effectively gives you more spreader rake.
Technically correct but you can still get to the same prebend with diamonds further aft on the mast...either by cranking more tension or sweeping the arma slightly more, or both. Main advantage of having the diamonds on te front is to make a single adjustment point, not two. The Tornado carbon mast no longer uses the single front mounts adjuster...the lower diamonds enter the SIDES of the mast near the base and connect to a single adjuster under the mast foot.
Here you can see the lower diamonds connectint to the metal strap entering the mast section:
Here is the adjuster bolt under the foot that the strap attaches to:
Note how far aft on the section this is...no where near where the previous alu mast diamonds attached. C-mast prebends just fine.