Here is the proper layout for the Rosewill L4500 case using the Supermicro X9DRH-7F motherboard.
Standoffs should only be located where circled in RED
Remove all the others (Stock locations appear in this photo.)
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And even after following this image check your damn standoffs twice more!
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Your motherboard standoff locations were bang on. Measured just because I am paranoid, but the board fit perfectly. Thanks for the photo!
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You did it the right way. Always measure it yourself. Glad the photo helped!