Enter the passenger-side rear window well, a six inch deep, 11" x 22" (roughly) vertical space, coming close to the dimensions of my BOB. While obscuring this window appears to reduce blind-spot visibility, I found little visual loss from the driver position when checking through the rear passenger door window.
Having kayaked for decades I thought to use a Bungee Deck Kit from Yak-Gear and adapt it to the periphery of the window well. The kit consists of six pad eyes and two J-hooks along with mounting hardware for a kayak deck. I replaced the hardware with 3/16" aluminum rivets with a 1/2 to 5/8 grip range. The kit also include ten feet of 1/4" bungee cord that I measured with the BOB in place, cut to fit and crimped.