You say you're getting an awning as well. You may want to contact 1der here on the forum as he sells the preferred mounting brackets for awnings.
Also, mounting a rack to a penthouse top will be pretty difficult to do without the proper "tools". Mounting the Aluminess rack on my van's gutter rails was a bit of a task involving tying it up to a roll up door, someone lowering it into the van while 2 other people balance it. I couldn't imagine having to deal with marking holes to drill then installing on a penthouse top. In short, I guess I'm saying you might want to order and have the install done at whichever shop you order from to save yourself the hassle. It would be money well spent.
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2005 E350 Chateau - V10 - Agile Offroad 4x4
2012 CTS-V Wagon - For the baby...
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