I have independent circuits each with its own IP address. Each circuit goes to one SRX as in post 1. SRX1 has x.x.x.x/30 from ISP, SRX2 has y.y.y.y/30 from ISP. Think of this as having 2 physically different Datacenters but they are not. They combine at the QFX internally. So I called the ISP and asked them how can I load balance between the circuits and SRXes. they suggested the managed router at their end and BGP, hence the second diagram.
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