On May 3, 4:16 am, bud-- wrote:
...
And you are again discounting a guide written by experts, peer reviewed
by experts, published by the IEEE, and aimed at technical people. You
apparently think electrical engineers are idiots. Where you disagree
with the guide you have not cited a source that supports your belief.
...
Francois Martzloff was the surge guru at the NIST and has many published
papers on surges and suppression.

Both of Bud's citations - guides for laymen - describe how a plug-in
protector can work AND how such devices can even create appliance
damage. Both state what an effective protector needs - short
connection to earth ground. Both state why a protector without
earthing can even contribute to appliance damage.

Even Martzloff is quite blunt about this. Bud quotes from Martzloff
selectively. Meanwhile this conclusion is so fundamental that
Martzloff makes it the first point in his IEEE paper:
Conclusion:
1) Quantitative measurements in the Upside-Down house clearly
show objectionable difference in reference voltages. These occur
even when or perhaps because, surge protective devices are
present at the point of connection of appliances.

A plug-in (point of connection) protector can contribute to
appliance damage. Every Bud citation says that. Even Martzloff says
that. Why do professionals routinely install 'whole house' type
protectors instead of plug-in protectors? "Objectionable difference
in … voltages ... [when] protective devices are ... at the point of
connection". Industry professionals note this problem with plug-in
protectors. Also are those 'scary pictures of plug-in protectors
located where fire hazards are greater. Bud conveniently ignores all
that. Profits are at risk.