I prefer laying it with the taper to the bedding, i dont like it the other way up. Ive never had any indian sandstone with what i would call a 'flat' side tbh. Just a less riven side heh. It can go down either way thought, its just whatever suits you
It's intended to be laid one way, as explained on the main website. If you choose to lay it upside down, don't expect any sympathy from the supplier if and when it goes awry.