They're not there (and there's no good reason why not, except that once again Hollywood's got its head up its backside), but you could try sideloading, or in the case where they check for a certain platform, see if someone on XDA or the like has done that work (like they did for Hulu+).
Wish I had a better answer, but sending feedback to the app asking "Where is the tablet version?!" couldn't hurt, either.
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