I've seen the coil relocated to the inner fender well, behind the strut tower and on a show car only down below out of sight. I guess it just depends on how long your willing to extend your wiring but I would try to keep the coil wire a short as possible. I've never lengthen mine but I would imagine adding length to the coil wire would at some point effect it's efficiency
Run them through the cowl vent panel, trans tunnel, inner fenderwells, etc and if there's a problem then they are pulling fenders etc to get to the wiring and trouble shoot. It's the price you pay to have a amazing looking engine bay but typically these aren't daily driven all weather type cars that people take the time to fill in hundreds of wholes, smooth out, wire tuck and detail the engine bay in neither.