Analysis of information sources in references of the Wikipedia article "Field goal" in English language version.
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For place kicks (field goal and convert attempts) the kicking tee platform or block can be no higher than one inch in height as per Rule 5, Section 1, Article 3 of the CFL Rulebook. For kickoffs, the ball may be held or placed on a tee such that the lowest part of the ball is no higher than three inches off the ground; Kicking tees are not required to be used. Kickers may kick off the ground if they desire.
The NFL allows the use of tees as high as 3 inches for kickoffs, but has never allowed them for field goals and PATs. The pro league, which began to declare its independence from the college game with a number of rules changes beginning in the mid-1930s, also has refused to widen the goal posts.
In the N.F.L., unlike college and the U.S.F.L., no tee is allowed on field goals.