Castello Greatline pipes are big for sure. I have found that the "scoop" based racks (scooped out bottom) don't work well. The Savenelli one pipe ceramic holders definitely will not work for your pipes of interest (but I do have one and love it for my small to medium sized pipes). For what you are looking for I think a pipe pillow will be best. You don't want those big pipes sliding off and getting scratched. Trust me, I know from experience.
This is what I used for a few years https://www.smokingpipes.com/accessories/pipe%20accessories/moreinfo.cfm?product_id=114623.
Here is a shot of my Castello Magnum Flame bent in its pillow. Works great.
The Savenelli ceramic (Goccia) stands are super cool! But not good for big pipes.
Of course, nothing beats a custom fitted Castello box with fitted foam for the Great Line pipes!
If you want to go Full-Pimp, you can invest in magnetic stands. They actually hold the big magnum pipes very well. Example, Neal Yarm racks. I have never/ever had a big pipe fall or slip from the magnets.