How to protect equipment from voltage anomalies
Any power interference that shows up in PC and laptop sound, but doesn't reboot those, must be RF radiation.   Power wiring isn't the main problem.
To get RF from a switching refrigerator, you likely have a dirty relay contact, or similar spark-making switch.

A common-mode clip-on choke on the refrigerator power cord might help,
but switch or relay contacts that are sparking are likely to fail soon.