I know that is where most people put there CB in the KJ but I didn't really like it. I went ahead and put mine on the dash. It may block a bit of the defroster but not much and I dont seem to need it much around here anyway.
I used Loctite 100 pound double sided foam tape on the back edge, the left corner and then on the bracket on the right side. I already ran the antenna wire behind the dash but still need to get some power wires and rerun that when I get a chance. It held up well while I was out over the weekend and seems to be sitting there pretty solid.

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04 Black Limited
Custom orange grill inserts, custom orange rock rails
Reese Class III Add-on Hitch
245 70 16 Firestone Destination ATs
http://www.clownthings.com/jeep