Every state in the US has a Chief Election Official who serves as the authority on local electoral process.
Today they will take
your questions
on Twitter during our nationwide #AskTheElectionOfficials event in partnership with @NASSorg & @NASEDorg.
Take a look. 
Each state handles this a little differently. In FL, each presidential candidate or candidate’s political party submits its own slate of electors.
More info from @FLSecofState here: https://dos.myflorida.com/elections/candidates-committees/presidential-electors/ …