I just had this random question pop up in my head while i was at the bank. Suppose i decide to call a professional home security system company to help me secure my home. What’s stopping the installer from tampering with the system or installing some type of backdoor to get access to my home at a later time? Would I just change all the physical locks in the house and then reset passwords to the security system after they’re done installing? And what other precautions should i take? Thanks!