Do you anticipate bolting it to the bosses used to mount the passenger backrest / OEM luggage rack? I have not seen a lot of detail on the mounting. Also curious about whether we need to use some flat plates to reinforce. Going with 8" or 10" mids? Curious as to why the speaker mount is angled and whether it is HDPE or particle board. Looking forward to install pics and picking your brain a little before I purchase.