Regarding UPS in the link , CyberPower are one of the cheapest UPS but are not that bad. I'm selling them sometimes but for bigger servers I always offer APC. Support is pretty bad in Poland but price beats all and batteries are easy to get.
You can find cables to connect UPS without issues. Less popular cables on local market can be ordered within ~2-3 weeks ( depends from store but it's usually time in distribution/manufacturer all over the world ).
Best is to get some higher power UPS than you actually need. As you see in that CyberPower link , 810W UPS will run for about 3 mins at about 700W load. If you really use ~800W ten best is to get ~1kW+ as battery performance is dropping in time.
You can find cables to connect UPS without issues. Less popular cables on local market can be ordered within ~2-3 weeks ( depends from store but it's usually time in distribution/manufacturer all over the world ).
Best is to get some higher power UPS than you actually need. As you see in that CyberPower link , 810W UPS will run for about 3 mins at about 700W load. If you really use ~800W ten best is to get ~1kW+ as battery performance is dropping in time.