Slanted Cap / Flat Rack

I have a potentially silly question but here goes:

I have a high-top ARE shell on my '98 Tacoma, Queenie. I'm looking for a rack for the shell, but as you can see here, the roof of the shell is not even a little bit flat.

I'm curious if anyone knows of any racks that are made to go on a surface that isn't flat, where the legs can be different heights so the bars of the rack are level?

If I have to, I suppose I can have my aluminum fabricator franken-cobble something together, but with a million things on my build list, I'd like to just buy something that exists if I can...

Thanks in advance!

 

Old style Yakima rain gutter crossbars work, seen it done. Front bar mounts on top, back bar mounts to the side. Yakima sells the adapters.