I opened up the tool tray area of the battery box and installed my first I/S's CB in there. A pair of closed-cell foam wedges were fabricated so as to hold the setup in position.
My current I/S will have this done when I install its radio. My Tourer has the Hondaline accessory CB radio set atop the battery box cover, and I'm going to move its Yaesu dual-band ham radio chassis (currently mounted under the trunk stays) into the toolbox area. Depending on fit, I may set the CB in the toolbox compartment and put the FTM-10SR chassis on top of the battery box cover.