Yeah, don't follow on a single twin on hard terrain. Weighting that over an edge is scary. My preferred method, since I do a lot (most?) of my multi-pitch with 3 people, is skinny ropes rated as twins and doubles. Something around 8mm. That gives the leader the option to clip both strands as twins, or to split them as doubles, while giving each follower their own strand.

PRACTICE please, the rope management, the belaying, the anchoring, the tie ins, all of it somewhere safe before you go for it on the wall. Seriously.