This Act does not apply to home rule municipalities with a population in excess of 1,000,000 so long as exempt municipalities adopt rules to inspect manufactured home installations, require correction of violations, and perform other duties mandated by the United States Department of Housing and Urban Development pursuant to Section 3286.803 of Title 24 of the Code of Federal Regulations, 24 C.F.R. § 3286.803. Exempt municipalities may require and approve non-governmental inspectors or inspection agencies, provided the exempt municipalities shall at all times exercise supervisory control over such inspectors or agencies to insure effective and uniform enforcement consistent with the rules adopted by the exempt municipalities.