Ummmmm, anywhere where:
-you can see it
-it doesn't get in the way of your vision
-it doesn't get in the way of an airbag
-you can easily reach it
You might want to just sit in the car and move it around until you find somewhere you like. I don't necessarily like the spot on the left because I like passengers being able to reach stuff too.

You may want to check out some of the dash mounts from
www.proclipusa.com as they have some that slide between the panels in different locations. For instance
If you went with the top/vent one they also make an extension that would let you mount the stuff lower. It would block your clock but at least you wouldn't have to drill any holes, and it's all removable.