Samsung over the range microwaves, like many others, use only one mounting bracket that runs horizontally along the wall behind the microwave to support it from behind, as well as screws that run through the cabinet above the microwave into the top of the unit. For more information about how to install your SMH1816, you can follow the link below for a downloadable pdf of the installation instructions:
http://ars.samsung.com/customer/usa...Please note that these instructions are the same for all Samsung over the range microwaves, including your SMH1816, though it is important to confirm the blower is angled appropriately for your desired venting.
It may help to have the microwave installed professionally, given the moderate level of difficulty involved. If you would like further information to help you get the most out of your microwave and to ensure proper performance, please refer to the user manual, which is also downloadable from this website, or submit another question with more information about any issues you may be having.
Thank you,
Ms. Samsung
answered 1 year, 6 months ago

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MsSamsung
SamsungHQ