These surge protectors are just glorified extension boxes with some mosfets in them. Not worth the price. I have the MX 4 strip surge protector with mosfets and it just allows high voltage to pass through to any connected items.
I had directly connected my MX surge protector to socket and when I switched on my laptop power adapter, it started making some crackling noise like some internal components were shorting with some ground. Connected the adapter to another socket and same thing. then connected to real surge protected output of apc ups and no noise. So these surge protectors actually don't protect against high voltage since it is not technically a surge to them They only protect the wiring in house from electronic items overloading the wires due to some short or using >2500W item on a 6A socket. All our pc electronics don't come in this category except pc with 1000W or more psu.
Surges in wires (mismatch between live and neutral) only come during rare lightning or if some electrical wires got touched together by mistake/during construction activity in somebody's house or in building or road, etc. For normal days, computer ups or lowest cost stabilizer without high/low cutoff is better.
