5v / USB standalone surge protection? Buck/boost boards?
so there are surge protecting devices for 5V and USB - just a quick pick from a supplier I know: https://www.bourns.com/docs/product-datasheets/cd143a-sr05lc.pdf?sfvrsn=3be0efe9_6
But this is the very last resort and the smaller the devices are, the less energy over time they can absorb.
Don't know which country you are from, but here in Germany there are so called Type 1,2 and three surge protectors. Type one can absorb the most energy, Type 3 is the fastest of the three. To protect the devices in your house, flat,... from external surge energy you need all three! Type 1&amp;2 can be combined in one housing and are placed in the cabinet where your fuses are. Type 3 is normaly in special multi socket Power plugs or in devices like a USV. Also there are additional surge protectors for antennas (e.g. sattelite TV) and copper cable e.g. telephone lines.
I would opt for the equivalent of our Type 1,2,3 surge protectors - even if they are somewhat expensive!. A PCB scale surge protection device normaly is to weak for external surges you need to expect from brownout/blackout/lightnings.
PS: these surge protectors are like airbags - once triggered, you need to replace em
Also if you prepare yourself with Type 1,2,3 surge protectors, and your neighbours don't... well current follows the easy path. Its then more likely they get gilled, not you.