I need a professional to help me remove unauthorized access and monitoring of my Apple devices.

For a Hacker to infect the computer with Their Software would require the Entity ( Hackers ) to have Physical and Direct access to the devices.

They would then need to somehow bypassed the Users Password or Guess the password to boot the computer, iDevice and plant the Hackers' Software

If these conditions are possible which only the User could know ➡️

This article from Apple may offer some advise

link below

If you think your Apple ID has been compromised

If, as you claim, you're being hacked then that is a criminal issue, and you should contact your local law enforcement. They will require your devices as evidence, so don't fix them.

Also, on the off chance that you're not being hacked, it's good to change your Apple password to something others don't know or easily guess.

And there is no professional here that can help you either. We are juts users like yourself.