when i set array it goes only to row, i need to get them to colum

function importExport() {
 
    var arrayCars = importRange.getRange(1,1,importRange.getLastRow()).getValues().flat();
    Logger.log(arrayCars);
    var unique = [...new Set(arrayCars)];

    Logger.log(unique);
    importRange.getRange(1,3,1,282).setValues([unique]);
}