I'm not finding this transistor to buy in my city. I would like to see if I can put 2 transistors in parallel from 60v / 50A to replace the AOT460 which is 60V / 85A.

For example, I put two in parallel:
gate with gate
source with source
drain with drain

Can I do it this way?

I tried to locate the circuit diagram of the UPS but I could not

Bad idea because gate current from source divided between two transistors and maybe not drive it. Try find equivalent from the same brand or other, i.e. https://www.infineon.com/dgdl/irf1018ep ... da854e1891
First compare RDS(ON) and VDS.

Посмотри по ссылке:
https://clck.ru/FKqaz

The only component I have at disposal with me would be an IRF2807 mosfet and by the datasheet says it is 75v by 82A. Can I put it on?

AOT460 RDS(ON) < 7.5mΩ
IRF2807 RDS(on) = 13mΩ
Not equivalent. The power dissipation will be exceeded and the transistor will burn. P=I*I*RDS(on)

Советую придерживаться 85А лишь для проверки можете 82A

What about the IRF3205? comparing the data sheets of both components?

On some sites, IRF3205 is referenced as an alternative to AOT460.

used the IRF3205 in place of the AOT460 and it worked perfectly the nobreak. Many thanks to forum colleagues