They're going into the garage on the right wall (the one near the red mushroom,) I'd like the vent to be a bit under the eave there (no soffits,) just so it doesn't show too badly over the address numbers . It won't be in the attic, just through the wall.
The total run is going to be maybe 5 foot across and 6 or so feet up, with maybe just the one 90 to turn "up" at the exterior wall. The dryer will up be on a platform we're building and we're building a new wall inside the garage for all the plumbing and the vent to be inside.
I was thinking to do a 60 or 45 off the back of the dryer, then a short bit of a flat spot that'll be the clean out, then across and up to the higher vent location. Though since the wall is basically just to hide the pipes, and isn't at all structural, we could just angle the main length of vent up to the exhaust port and skip 90s all together.