The advantage of a good frame/sill mounted set of sliders is their extra strength. Sill mounted sliders can bend the sill, easily, and then you can't opn your door.
Try RTE, they have one of the better Sliders as does Slick Rock.
The other thing you can do is build your own, if interested, I have some plans I can send you that should get the job done for you.
Mike
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