Hoya lithophytica Has To Be Grown As a Hanging Plant

I’ve seen it written that Hoya lithophytica can be grown on a support, and it simply cannot be grown this way in my experience.  This species is stiff and only wants to grow downwards.  I think that it is because of growing on limestone cliffs in its native habitat.  It must also be grown with limestone added to its mix, or it simply won’t be happy.