If you are doing well, not getting access denied errors, or running 2-3 tasks per site without any problem, then you don't need to use proxies.
It's better to use 1 proxy for each account, but you can still use 2 accounts per proxy.
Please check: How to insert proxies inside the Bot?
Don't forget to add 25 proxies for monitoring! Because you monitor the site before the drop even if it’s a countdown link, please ALWAYS put proxies there.