RTT Mounting Behind Cabin

I've got a Ford 2011 Ranger PK Dual Cab and I was hoping to mount an RTT over the tray.

I need it to be a hardshell for mounting on top of it and I'd ideally like it to be behind the cabin, not above the height of the roof. Ideally, I'd need quite a short tent for this, which comes to my issue:

I've found several shorter cantilever options similar to the Darche Double Dee and the 23Zero Yowie 1600, but I'm unsure of how or if mounting on these larger options would even be possible.

My tray is approx 1550mm long, and some of these tents can be around 1750mm, would I be able to have that ~250mm overhang over the rear? Would I be able to butt it up closer to the cabin? Is sliding the mounting around like that even an option with most tray racks? Could these tents be mounted sideways and have the ~250mm overhang over the sides of the vehicle?

It's quite hard to find stockists in my area so measuring in person or dry fitting before purchase is probably not possible

Thanks
Hex