I doubt canaan would even be part of the same universe than Tsukihime / fate, unless Nasu suddenly include that (which wouldn't really add anything in the lot to say it bluntly).
Anyway, as explained, you would be fine with these OVA if you know the original story of Tsukihime and Fate/Stay Night.
However, few subtles points and jabs might not make any sense if you don't expand to the other stuff such like Melty Blood (Shion and Risbief would be total mystery for those who just read tsukihime and F/SN).
And considering the opening and ending, there are also some trend within nasuverse that would be hard to get by without the other more obscure stuff (Kagetsu Tohya and Tsukihime plus for Ren and Satsuki etc).
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