The BossBox is touted as being able to handle 2 inverters, mounted on the sides of the box, with 2 or 3 batteries inside. Instead of 2 inverters, can you mount 1 FlexBOSS and 1 GridBOSS on the sides, with 3 batteries inside? Can you route the FlexBOSS --> GridBOSS cabling through the inside of the box?