Renting, I'd want something I can temporarily attach to arbitrary pre-existing blinds. On reflection, there are several types one might encounter but I'm particularly thinking of the "twist stick to adjust horizontal slats" style. (As opposed to "loop of chain controls angle", or "fully unroll from top".)
I think there was a Show HN some months back where somebody 3D printed a mount so that the twist-stick could be slotted in at a slight angle.
I've been thinking of a time-controlled motor on my window blinds.