The adverb 过于 is placed either before an adjective or a verb.
You've been working too hard lately
nǐ zuìjìn guòyú nǔlì le
You're relying too much on your memory
nǐ guòyú xìnlài nǐ de jìyìlì le
过于 can also be used as a verb "to exceed".
To avoid oversupply
bú yào gōng guòyú qiú
The verb 过于 is used as part of the phrase 最…莫过于
This phrase emphasizes that something is "the best".
This structure is used in written language.
In this structure, you first state the topic of the sentence and then you give your answer that you think is the best. The answer is placed after 莫过于. It can be expressed by a noun, a verb or a verb phrase.
The best university in the United States is Harvard University