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Again just speaking generally here, you really need to have a look at the codes for where you live to get the correct information for your location.
The reason for putting the coax grounding at the point of entry to the house is to keep any spike from a nearby lighting strike from going into the house on the coax. Cable on the outside is more susceptible to picking up that spike than on the inside.
If you have 30 more feet of coax on the outside of the house AFTER you ground it you are kind of defeating the grounding. And most likely violating your local codes. That's why the recommendation to run a grounding wire the 30 feet to the service ground and not the coax. But again, check your local codes.
On the other hand if you want to enter the house AT the service panel, then putting the grounding block there is what you would want to do.
Of course nothing is 100% and if the strike is close enough it's going to get in.
As to where to enter the house the only thing to consider is you want your coax run to be as short as you can to keep any loss from long runs at a minimum. Other than that, it's really up to you where the entry point is. It may not matter though, depends on your signals, and total length of run.
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