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Specialized toupe, not carbon rails.
Cool, so you can use something like the B&M rail mount if you like which will mount it there.
Will a Son one play nicely with the Ixos?
Yes, in fact all the internal electronics and lens are made by B&M. SOn just machine the alu case.
There are two son options. A rack mount and a seatpost mount. The rack mount could bolt onto the bracket that attaches to the rails, and hang just under your saddle. However in this case a saddle back could interfere. For a lot less money the B&M Top Line Small is the same light with a plastic case that'll do the same job.
For the nice SON seatpost mount one it simply has a band which straps to your seatpost.
What saddle do you have are you planning on mounting on the back of the saddle or the seatpost?