Solved Server.itemdespawn - where to write it so it will be persistent?

Hello, so recently i started to use command "server.itemdespawn 60" - got many players and cause of ZLevels and crafting rewards people are crazy crafting and droping things arround, so instead of 3 mins for despawn i started to use this, but when I use it in RCON its not persistance after server (rust app not the whole server) restart it is again back to default 180 (3 mins). For now I use TimedExecute plugin to run this command like 3 mins after server is running, but i am for sure there is some file (server config, bat file or even autostart.cfg?) where I can write it down and have it persistant and default on server start. So my Q, where to add it? Any ideas?

 

thanks, if I will add it to the command-line/startup script should it have + or without +? Also what is better, command/startup script or cfg of server?