Power Conditioning / Surge Protection

"Balanced surge protection" is an interesting name.   Since our USA 120VAC power is split phase, single ended, balanced means it either works for 240VAC, which is balanced, or it applies the same filtering on the line and the neutral, even though it is an unbalanced line.   (The only other option is it just a cool name and has nothing to do with the design.)

There are two schools of thought among engineers here.   Some believe filters on the neutral line is a good idea, others don't.   If you design this stuff, you will be in one group or the other, to be sure.   

All the surge devices for which I design at work, have filters on the line and neutral.    For audio work, I leave the earth connection alone, for industrial stuff, it often has voltage limiting on it from neutral to earth. 

The "inductor in parallel with the line" term must mean in series with the line, since it is counter productive to put it in across the line, and in parallel means the line is shorting it out.   If they mean something else, then it is not in parallel with the line.

Yeah, I still believe his is marketing wording talking here. 

Given how an inductor works, putting it in parallel with the line is counterproductive.   The word "Parallel" here means connected from Line to Neutral or from input to output with the grid wire shunting it.   Either way, it is counterproductive - in the first case, inductors don't work that way, in the second case, it is effectively out of the circuit path.   

They could, and probably do, use a common mode inductor, which would explain using the word balanced, but the two inductors are still in series with the load, not in parallel with it and definitely not in parallel with the grid line.  The RFI capacitors, MOV's, resistors, GDT's, voltage clamping diodes, will all be across the line. that is, connected from line to neutral.

Reviewers often quote manufacturer's literature in their discussion, so the fact that reviewers state the same thing doesn't mean they verified the claim using standard engineering electrical terminology.