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Neo-angle roof openings, with one corner cut at an angle rather than square, need a skylight shaped to match, and Specialty Recreation makes this one specifically for that layout. It's built to drop into a 24" x 12" hole with a 27" x 14.5" flange covering the edges.
The dome is thermoformed polycarbonate rather than a cheaper acrylic, which holds up better to years of UV exposure without clouding or cracking, and it wipes clean easily. A tube of approved urethane sealant ships with it since that's required for a watertight install.
Measure both your rough hole opening and the angled corner carefully before ordering, since neo-angle skylights are more particular about fit than a standard square dome.