This also depends on how you mount your drives. You don't "need" a bracket at all, the drive is so light you could just connect the cables and lay it in an open area avoiding metal surfaces to short against. If you're the least bit handy you could make a bracket out of some rubber bands or zip ties.
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out of seriousness. I don't recall them having any issue with running at an angle or anything like that...what would laptops do? Mine rests at a 45 degree angle due to cords
From my understanding, you should position a mechanical harddrive(the ones that use ball bearings in the motor) the way it's always been oriented since it was new. That's either horizontal or vertical. The reason being the ball bearings have ground a path in the race where it's in equilibrium. If you alter this the motor have a tendency to vibrate more.