Sorry, maybe I am not writing clearly. What I am suggesting is three separate circuits from the same circuit box (I did not mention this… just in case you have two), each with a separate breaker … . The important point is they are going to be run without anything else on the line (hence they are called direct lines). I have run them on the same or opposite legs of the box (220 in box has two legs with a breaker on both). Many folks advocate having them all on the same leg. I have never had a problem either way
Typical home wiring runs all over the place such that a single breaker will not support outlets next to each other, but will support a bunch of outlets and can have who knows what plugged into it. Also with multiple outlets there can be resistance in old outlets.