Monitors Management

Hi, have 5 monitors and i run Ubuntu 19.10. My GPU's max is 4, but it's not a problem since i need 3 maximum active simultaneously. Even if i have settings working (other 2 disabled) in the login screen and in the session, during the transition output is pushed on all monitors attached (and of course this causes a crash, since GPU can't handle... ). Tried to ignore the ones i don't use with xorg.conf, but maybe it's needed something more drastic than that.