GFCI is how to get human safety without any safety ground. Safety ground is also called equipment ground. It is completely different from earth ground.But I'm not sure that will satisfy the requirements of the surge suppressor. GFCIs are for people. I just don't know enough about how the suppressor shunts over voltage to the ground at the outlet to say if the GFCI is all it needs.
Effective protectors work by connecting tens of thousands of amps on a low impedance (ie less than 10 feet) wire to earth ground. Then hundreds of thousands of joules harmlessly dissipate outside; do not dissipate destructively inside appliances. Protectors without earth ground (ie his power strips) do not claim to protect from surges that typically do damage. Those have all but no earth ground if used on two wire or three wire receptacles. But surge protector strips can become dangerous to human life if not connected to a safety ground.
Meanwhile, best surge protection for all three wire houses is also best protection for two wire (pre-1960) homes. That is one properly earthed 'whole house' protector. Then hundreds of thousands of joules harmlessly dissipate outside. Then his computer and power strip protector are protected from surges that can actually do damage. And that, in rare cases, can result in a protector generated fire.
'Whole house' is the only solution always found in facilities that cannot have damage. It costs about $1 per protected appliance. Or can be rented from an electric company that installs it behind their meter.
Protection is defined by the quality of and connection to earth ground.