I used 6 wood shims that were superglued together. I used that as additional surface area for the mount.

https://imgur.com/a/49MfdPB

NELSON WOOD SHIMS PSH8/12/65 12PK 8" Wood Shim, 8" https://www.amazon.com/dp/B01FUZAYBO/ref=cm_sw_r_cp_api_i_WjAWEb5JQEQAS

Krazy Glue 2063184 Fast Dry Wood Glue, Clear https://www.amazon.com/dp/B07QFC118C/ref=cm_sw_r_cp_api_i_TkAWEbHMVWBC6