Heavier cases like my NZXT Mid Tower are very difficult to mount but hold it very firmly to the top of the mount and have the lowest profile of any undermount mount I've tried by far. The drawer version is also a lifesaver when you need to power up the case or swap out cables on the back.
MoKo Universal Laptop Stand Bundle - 4 Pack Anti-Slip Silicone Elevation Stand for Tablets, Laptops, and Keyboards - Gray
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π» GIKERSY Adjustable Height Laptop Stand - 1.5" to 20", Ergonomic Sit to Stand Laptop Riser for Desk - Compatible with MacBook Pro, Dell XPS, Lenovo, HP & More 10-17" Laptops
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