Proxy question- if I even need so many proxy

Hello.
I am very new to the concept and idea of proxy.

I am an Amazon feedback provider.
I was informed by my fellow friend that I need a proxy for
1) Each Gmail account created.
2) Amazon buyer account.

Any advice of what type of proxy should I be looking at?
Right now I am using different
1) computer user to replicate different computers.
2) a rotating IP SIM card provider to display a different IP so that amazon doesn't track it is coming from the same "user".

Fow how many accounts you need proxies?

If it’s only one you are better of buying a VPN - the benefits are greater.

Yes if you want for some account then VPN go ahead.

Else get Dedicated IPs for such task.

Thanks for the reply. I need it for some account. I guess I will need proxy since I need about 3-4 new iPs daily