Hello,
Thank you for reaching out and letting us know your inquiry about installing this Samsung microwave above the cabinet only or needing wall support. We understand that this information may be essential for you. We're here to help.
As per checking, wall support is necessary to install this Samsung microwave. A wall plate comes with the package.
For reference, attached is a link to the installation guide that you can check.
https://downloadcenter.samsung.com/content/EM/202202/20220223181324341/SMH8165_XAA_DE68-03587A-12_EN_220120.pdf
For other concerns, do not hesitate to reach out via our Support Channels below:
1. Facebook Messenger: http://m.me/samsungsupport
2. Twitter: https://twitter.com/messages/compose?recipient_id=18768513
3. Samsung Community: https://us.commuity.samsung.com/t5/Samsung-Community/ct-p/us
Thank you, and stay safe!
Your Reference Ticket Number: 1144292649
-Angelica