The correct expression is 'Have I made myself clear?'. The past participle of 'make' is 'made'. And to answer your question: No, you definitely should not say this to a boss, older or higher status person. It would sound very rude indeed.

Hi! Like the previous person said, the correct way to say it is "Have I made myself clear" because "make" should be in past tense form. That's certainly not something you should say to someone like your boss or one in higher authority than you. Rather, I reccomend you use this phrase. "Do you understand my intention?" Although it really depends on context. Good luck ~^^