Before installing a dash cam in any car, you would check how far the wiper goes because if you mount it above the wiper's reach, it will not have a clear vision. And because of the Subaru Eyesight system, we also need to ensure the dash cam is mounted outside the Eyesight camera's field of view.
For this Thinkware U1000 installation, we installed the front camera just behind the rearview mirror - it's right next to the mount for the rearview mirror and right in the blind spots in-between the two Eyesight camera sensors.
Nearly all dash cams will fit in this area - but we strongly recommend a small wedge-shaped or a cylindrical tube-shaped dash cam with a sticky adhesive mount that attaches right against your windshield. Try to avoid dash cams that use a hanging mount, as they will take up more space and potentially get in the way of the Eyesight sensors.
Since Eyesight only exists in the front, mounting the rear dash cam will be like any other. We typically mount the rear dash cam on the windshield, along the edges, with the top middle being our preferred mounting location. This placement allows us to snake the cables through the top headliner for a cleaner finish.