Hi Chendo,
Thank you for your question about mounting your Samsung hoods. Most Samsung hoods are designed to be mounted under a cabinet for stability.
For your specific model, please refer to the installation manual, which provides detailed instructions and safety guidelines for mounting. Typically, the installation manual includes wall-mounting instructions and specifies any additional hardware you might need on pages 7 - 11 of the "Installation Instructions" section of the manual.
Manual
https://downloadcenter.samsung.com/content/UM/202207/20220708120022098/NK3500BM_NK30B3500US_AA_LIB0175247A_v2.pdf
Should you need more assistance, please feel free to get back to us via the following options:
1. Facebook Messenger: http://m.me/Samsungsupport
2. Twitter: https://twitter.com/messages/compose?recipient_id=18768513
3. Samsung Community: https://us.community.Samsung.com/t5/Samsung-Community/ct-p/us
When you message us, please provide us with this reference number (1147158270) to help our team gather your information.
Have a great day.
^Charles