A drive mounting bracket would seem simple and straightforward. But as I realized, there are quite a few gotchas that are very common with these. I ordered another maufacturer's 2.5 to 3.5 adapter, and found that they use M3 threading for the external screws instead of the standard 6-32 threading that is standard on 3.5-inch drives (and it wasn't a cheap no-name). Now you might think that since the bracket comes with screws, that wouldn't matter. But many of the higher end cases have special drive bays, which might require use of their own screws. Mine was one of these cases as the screws have rubber bushings on them for vibration. The screws are 6-32 threaded, the industry standard. So when adapters don't conform to the standard, it makes them useless for some people.
Another pain point is that many brackets don't seem to place the screw holes where they should be either.
Just something to be aware of. Even the simple things can be done wrong.