5-iron tee height.
¼ inch ball-bottom on a Par 3. The 2-iron tee in our pack covers this.
The short answer
¼ inch (6.4 mm) ball-bottom. Use the 2-iron SKU.
Why
Mid-irons want ball-first contact with a slightly descending strike. A low tee preserves the iron's natural strike pattern while protecting the mat from a fat shot.