Does anyone know why Foretravel put 3 inch by 1.5 inch (like two by fours) wood behind the OTR Microwave? This moved the OTR Microwave three inches away from the wall and toward someone cooking using the cook top. The instruction which came with the replacement Sharp R-1874 OTR Micro indicate attaching unit to a 2x4 stud wall with drywall ( zero clearance). Nothing is...