I have 2 of them mounted. only 1 size fit on the rack behind the tire. I'll try to show an image. The image is a little old. Since then, I moved the periscope down and the tire up. Added a stop light in the spare. Added a little more rear lift...and you can see the results in the second image below.My plan as well.
What size did you go with?
Thinking I’ll only mount one container as I have my shovel and a few odds and ends on the other; however, may need to rethink that as I push out on longer trips.
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Here's a more recent view...