I'd expect both generic switch and audiophile switchs that comes standard with switching power supply to benefit from LPS. All switching power supplies will feed garbage back into AC circuit, using LPS on any equipment shared with rest of system AC will be of benefit. The smallest benefit for me was on the fiber media converters, but still worthwhile.
Speaking of LPS, I've been curious as to whether adding an LPS to a modem would be worthwhile. I presently don't run my modem on system ac line, so not worried about garbage feeding in. I just wonder if LPS is still of benefit beyond the issue of switching power supplies feeding garbage?