If your electricity source is a problem then voltage regulator and/or surge suppressor is recommended, or both.
That little thing you linked to is probably not appropriate, but it will probably do something. I'd look for something more heavy-duty/bigger myself.
lastly, I've worked in areas where stable electricity is a problem - blown PC's power supply, blown switch ports, damaged UPS, but haven't yet found any failed laser printers. Maybe just lucky or their power supplies are built well.