SVG is not supported by mobi (at least by the "classic" mobi format). It is supported by ePub, though, but whether the particular features you want to use are supported by any specific reader... that's something that has to be tested.
By the way, I used SVG to rotate a couple of lines of text in my Tom Sawyer ePub (it can be found in our library here at MR), chapter 5.
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