You are so close. The line you have provided looks like:
  my $employees_loh = $dbh->selectall_arrayref($query2, {Slice => {}});

To add the parameter the selectall line needs to read:
  my $employees_loh = $dbh->selectall_arrayref($query2, {Slice => {}}, $employer);

In reply to Re: Using placeholders in selectall_arrayref by bravenmd
in thread Using placeholders in selectall_arrayref by bradcathey

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