Will this monitor my traffic correctly?

I'm attaching a rough diagram of what my network looks like. If I'm monitoring "ingress" traffic where each of the arrow heads are at, will that catch all of the traffic on my network? At this point, I'm not concerned with traffic within the clouds and the Layer 3 switch at the bottom (the square) doesn't support Netflow.

The most that I can see missing is traffic originating in the top router and destined for the world and traffic originating in the bottom two routers and destined for the LAN. The netflow exports from the bottom two routers won't be counted, but since those are cable connections compared to 2-4Mbps for everything else, it won't matter at this point.

Any insight and/or suggestions you can provide are appreciated. Thanks.

---John Holmes...