That's what baffles me about this whole thing. Unless your roof is rectangular with homogeneous shadows, if you connect the shingles, say, in rows, you'll have unbalanced voltages. Is the plan to have a microinverter per row of shingles?

There's two types of tiles. I suspect they just use the same number or row and then fill in any gaps with the non-solar tiles.

That makes sense. It also lets you avoid areas with shadows, by using the non-solar ones there.