Hi all. Sorry for asking such a simple question but the instructions included with the shower drain are not clear at all. I'm installing a tile shower drain before the pre-pack gets poured for a custom tile shower enclosure, however I'm not sure which part of the drain should rest on the subfloor. The subfloor is actually 1/2 + 5/8 plywood if that matters. Here is a picture of the drain. Please help. The tile guy is supposed to start on Monday :|.