Not sure how you plan to ground to an outlet cover screw. I assume your junction boxes are metal? And ALL wiring is run through continuous metal conduit? And that the (probably) fuse panel is grounded to Earth? I think that might have been acceptable in the old days, but not by modern standards. However, multiple pieces of steel conduit and multiple steel boxes just can't compare with a proper ground wire.
In order to have "proper" ground, and in order for the surge protector warranty to be accepted, ......I doubt they would accept warranty from your wiring at all.
Back in 2000, we had a direct lightning strike in a brand new home. Everything was grounded and all up to then-current specs. And yet, the surge protector company still refused to honor the warranty for the computer and other attached items.
If you don't care about warranty and simply want to protect your PC from power surges, then I'd recommend a different approach for your home - however, it will require a bit more investment and be a little more effort. BUT....it will provide MUCH BETTER protection for your electronics!
1. Figure out what all you wish to have protected, then go and add together the amp draw of all these items.
2. buy a power inverter that is rated about 50% higher than the amperage draw.
3. Connect the inverter to a battery. If you wish to have some amount of run time to allow for properly shutting down your PC in the event of outage, you'll need at least one car battery. Length of time needed depends on how much draw (ALL items powered by inverter) and how long it takes to power down.
4. If you don't care about "backup power" for powering down, then you can use a much smaller battery - like one for a riding mower.
5. You will also need a decent battery charger, but not an overly expensive one. The charger will keep your battery fully charged, and the battery will provide beautifully clean power to your electronics. If you ever get a direct lightning strike, the surge "might" still affect the electronics, but much less chance than if using a surge protector. The battery/inverter system also protects against ALL minor power fluctuations!!
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