I'm thinking of using the B-Tech BT-38 to mount the Monitor 30. Problem is that mount requires to drill a hole into the cabinet. So my question is if it is safe to drill, where would I drill so not to damage the internals of the speaker? Can you please provide a schematics of the inside?

I know I could use the BT-77 so I would not need to drill a hole on the cabinet, however the reason I chose the BT-38 because it has 37 degrees of tilt compared to 7 degrees of the BT-77.

Below is the link for the manual of the BT-38


Thanks in advance.