interesting idea do you have a picture of that?If your soffet is vinyl and has a channel on the house and facia sides, just cut a piece of 2x1/8" aluminum long enough to tuck into those channels and mount the camera to that. I've got turrets and bullets mounted that way and it works fine, with no holes needed if you're "creative" about wire routing. A dab of silicon seal on each end will keep the aluminum bar from moving and still make it removable, should the need arise.