I would recommend the one most likely to electrocute you. : A mobile
electric chair in an RV. : A fitting punishment for this pervert's crimes
against virtually everybody
!

May I be so bold to recommend that you try a voltage tester, or if one
isn't currently on hand, try sticking your Johnson into plug..you might
even meet your imaginary supreme being, ya uneducated fundy moron

 The protector that is located 'in series' really does not
connect 'in series'.  A plug-in protector connected to the
other wall receptacle is electrically connected same as if on
the appliance power cord. Electrically connects in parallel
just like another light bulb, no matter where the protector is
physically located.

 Protectors are not protection.  A protector is simply a
connection from that electric wire to ground.  IOW an
effective protector is located where a connection to earth
ground is shortest.  Earth ground is the protection.  The
protector is simply a temporary shunting device to earth.  A
hardwired protector that is located closest to power pole will
be the most effective protector.

 Joules determines life expectancy of that protector.  Since
they really don't claim to provide effective protection, those
plug-in protectors also have too few joules.  Why waste money
on more joules when, if the protector vaporizes, the naive
will both recommend and buy more?  Better to undersize it.  An
effective protector is also properly sized (sufficient joules)
to shunt a destructive transient AND remain functional.  That
also means the hardwired protector is recommended.

 A hardwired protector is located so that a connection to
earth ground (on the power pole) is shortest.  That earth
ground rod on power pole is the protection.  The protector is
only as effective as that earth ground.