Unbalanced Loads Protection and Three Phase Phase online UPS working

Buy offer Details

Dear Ms .
I am a hobbyist and therefore only require one UPS. Recently two of my full tower Pcs failed unexpectedly and I am sure it was due to surge/spikes or brown outs. I want to protect all 3 maybe 4 PCs in the future, I am repairing one of the towers and completely re building the other with latest CPU and mid level graphics card, I dont play games. The new build is costing me about 1800 pounds sterling so I dont want any of the same problems again. I am English and live in Nanning China permanently so I want all technical literature user manuals etc. in English if available. I would also like some advice sizing my computers re. their Kva ratings. I was a professional electronics engineer before I retired
but not in this area. From my crude calculations I think I might need a 6Kva unit, perhaps you can give me some idea of price for this unit, thanks.
Regards
David Pollack