UPB filtering needed on the neutral?

[Mr Spock]

I will have several switching power supplies and UPS that need to be filtered. Most of the wire-in filters seem to be singled ended filtering. That is the inductor/choke is only on the hot side. There is no inductor on the neutral. Was thinking I'd buy double and put one on both hot and neutral. Ground is of course untouched.

Anyone have an opinion on this? Is it of any practical value? Seems like the right thing to do.