What is the head in the picture? A picture is not always worth a thousand words.
Will this head allow the C90 to point to zenith? That's also not clear from the picture.
Kenko KDS mount, I believe it has been discontinued for a few years. It is small and packs nicely.
It does not get all the way to zenith, but it comes close enough for what it is... I can wait a few minutes then view if it is directly overhead, or if it is a special event I'll have a different scope and mount. Most of the time it is pointing less than 45° because I like planets. I have modified it to get closer to zenith (that is described earlier in this thread).