such petition and if it has reasonable cause to believe that a question of representation affecting commerce exists shall provide for an appropriate hearing upon due notice. Such hearing may be conducted by an officer or employee of the regional office, who shall not make any recommendations with respect thereto. If the Board finds upon the record of such hearing that such a question of representation exists, it shall direct an election by secret ballot and shall certify the results thereof. The Board shall find the labor organization’s proposed unit to be appropriate if the employees in the proposed unit share a community of interest, and if the employees outside the unit do not share an overwhelming community of interest with employees inside. At the request of the labor organization, the Board shall direct that the election be conducted through certified mail, electronically, at the work location, or at a location other than one owned or controlled by the employer. No employer shall have standing as a party or to intervene in any representation proceeding under this section.