You can notify some of those towers if you plan to fly nearby and then if they allow it (usually they do) you can fly while observing the FAA Rules and Reg's
B4U Fly really only shows airports, heliports and TFR's (temporary flight restrictions), I found that my city has more restrictions that are a lot more limiting than airports but they wont show up on the app. I agree with BD0G, you can probably get clearance, especially since these are heliports and probably less busy but make sure you check local laws as well.
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