I don't think most dress shorts work well for sitting on the floor, because the fabrics often don't have any stretch or give (chino). These look like they have pleats, which could puff out when you're sitting. And, they can ride up/pull, and look weird around the thigh. Also, I wouldn't put shorts in the business casual category...I'd put them strictly in the casual category.
It sounds like they're telling you to expect to sit on the floor. Sit down on the floor in front of a dressing room mirror and see how your options look! That includes the back...make sure nothing rides down too far.
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