My webhosting won't allow "Options" in .htaccess
Options -Indexes prevents users from seeing which files exist in a directory. You shouldn't use this feature to secure your site, it mainly exists for aesthetic reasons. It is technically never necessary.

Options +FollowSymLinks is not necessary in a vanilla Drupal installation, chances are you do not need this one either.

Have a look at the documentation of the Options directive for more details.