Can work without proxy. Easy and free. You just need user:pass combo.

https://raw.githubusercontent.com/CYCOABHI/LoL-Account-Checker-PuppyLover101/master/Sample%20Image-Accounts.png

Download Link : https://www.mediafire.com/folder/dmi2uopkl5s3t/lolchek
Rar Pass : 2023
Love you guys <3