Define clean.
Most, if not all are going to be in the lower portion of the dash area. Usually 6-7" screen with a few buttons for controls. This leaves the cubby door above where it is.
The next level, though not for navigation purposes (directly) have been screens in the cubby area. So say run OEM radio or aftermarket and then place a 7" tablet or screen in the cubby. A few examples of this option are below:
Most have followed the same format I wrote up a couple years ago. You take the OEM navigation dash piece (
Link) and then fill in the screen with whatever you want (tablet/7" screen). Then fill in where the keyboard would have gone with filler.