Yes that’s true. I’ve seen them on roofs in Mexico and Indonesia. The mount is heavy but permanent (can’t rot) and works well both as a raft and a hanger.Tom, your well grown Catt says .... you made everything right. But this seems an old custom to mount orchids on roof tiles.
I read in the book of Walter Richter 'die schönsten aber sind Orchideen' (but the most beautyful are orchids), page 166-167, that it was a custom in countries of Central America to mount orchids on roofs of churches. In 1870 Benedict Roezl, an orchid hunter, found Cattleya skinneri alba mounted on the roof of a church in the region of Tetonicapan in Guatemala.