Most consumer level UPS's are just offline UPS's, basic battery backups with NO POWER FILTERING, or protection, on either supply or load side.
They'll keep the power going during a voltage sag, or total outage (for a short time) ... but if you get prolonged overvoltage, or transient overvoltages .. say goodbye to your equipment.
An intelligent line-interactive UPS is the minimum you really need, if you like your PC The auto-transformer will prevent damage from sustained overvoltages, but practically no relief from transients (like lightning).
Thankfully the biggest transient overvoltage killer (lightning) generally only affects the transmission system (the big cross-country powerlines) due to it's height, and the distribution network is protected, and generally not hit by lighting often. The US has alot of underground distribution systems, making opportunity for lighting strikes practically negligible.
It won't protect your equipment from negligence of the power company ... capacitor bank switching, anyone?
If you want total confidence in your IT gear, you need a fully blown Double Conversion/ Fully online UPS. The supply side charges the batteries ... the batteries supply an inverter on the load side. Practically total isolation between the supply side & load side. Expect to pay Big $$$ for these, in any sort of decent capacity.