If the power bars or suppressors have a wiring error you could get into trouble. There are simple under 10 buck outlet checkers which I'll share a link to without endorsement.
The tester would be used on all outlets and one more thing. DO NOT MIX across the room in the USA as another wiring defect could get you 240AC vs 120 Volts. This is extremely rare so there are at least two wiring defects that could cause trouble and why this advice was given.
As to the USB charger, a good charger would not care as well as the device under charge.
I just bought a power bar with multiple outlets which has surge protection. I am thinking of plugging in my Acer Aspire V 17 nitro laptop into it. However, I recently read that I should mix up "extension cords" with surge protectors. On my laptop the power cord goes from the computer into a rectangular "box", and then I plug in the power cord from the wall outlet into this rectangular "box". Does this count as an extension cord, which means I can't plug it into my surge protector safely? Also, out of curiosity, what about chargers for my Android tablet? I plugged the cord into the USB port on the charger then plugged that into the surge protector. Now, I am using the USB charger port on my surge protector.