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I use the Shock Absorber Max support tops. They look like a crop top but are encapsulation style. I just sit my HRM under my boobs but above the band. It works perfectly well and I've never had any problems (I've run a couple of marathons like that). I like them cos they have lots of different colours and definitely no bounce.
As for size I find them quite tight around the band so have to buy a bigger chest size. Usually I wear 30 G but I buy 32FF.
I can recommend Less Bounce, also Boobydoo. I usually buy from whichever is cheapest or has free delivery ...