My firm is a specialized distributor of “Power Quality” products, ie we have leading technology for EVERY type of electrical disturbance. Rarely does one band-aid fix every problem.
UPS’s are strictly for outages, brown-outs and loss of power. UPS units have transient spike protection to protect themselves, not your critical load. I strongly suggest adding a surge bar to the load side of your UPS in every case.
Whether the UPS is “stand-by” or “always-on” it diverts surges to ground to protect the battery, charger and rectifier. NO UPS re-creates the neutral or ground circuits but merely uses them as diversion pathes for damaging spikes. Spikes are bi-directional and the neutral is the incursion highway for spikes to enter your computer bus.
Official terminology is: a transient is 8ms or one half cycle.
Static electricity is a transient spike capable of as much as 5000volts. How is your UPS going to protect your PC tower if your touch you keyboard or PC chassis?
According to IBM over 88% of all electrical disturbances are transient spike related. If money is limited, dollars are far better spent on transient spike protection.