I have a UPS with surge and line filtering / voltage regulation on the laptop power line.
This protects your entire electrical system. I will try to find the pics of the RV that was parked near mine in 2007. They didn't have one of the protectors I mentioned. Luckily, they did have insurance and weren't "home" when it burned.
The device in the second link will also step up the power in a partial brown out type situation. Saves lots of appliances.