Kai,
The thermometer in the side at the top worked out very well.
This is a shot of my original setup for pizza. The thermometer, clipped under the rack and cut down pizza stone, (15 1/2" x 10 1/2") cracked on the first preheat. (The cracks in the glass are visible at the topside of the thermometer)
The pizza stone trapped too much heat underneath it, not allowing enough heat to go above the stone.
Here are the veiws of the new thermometer. I drilled an 1/8" hole through both wall surfaces about 3/8" below the ceiling of the oven's interior. I cut off the excess material not needed on the clip that came with the new thermometer and clipped it into place.
I did some heat tests with the thermometer in this location and these were my findings:
1. The original thermometer cracked after about 5 minutes of pre heating the oven, it read 550F.
2. With the pizza stone still in the oven, the new thermometer registered only 400F, after 10 minutes of preheating the oven.
3. I removed the pizza stone and preheated the oven with just the rack. It took 3 minutes to get to 450F.
4. With the new 13 1/2" x 9 1/2" x 1" non stick black metal baking pan, it took 3 minutes and 45 seconds to get to 450F.
I baked the second pizza with this new setup at 450F for about 20 minutes.