It has been an obvious question and it turns out that we are now able to refine it somewhat. It is also reasonable that the probability of impact will increase sharply as we transit the center line. Thus it appears that we are in a high risk era.
Saying all that, we are also approaching a level of technical ability that will allow us to create deep underground refugia for the entire population with the transfer capability to shift exposed populations away from any impact zone. I expect this to be done in concert with the complete terraforming of earth..
We have already posted extensively on the engineering of deep habitats. One mile deep is easy as no temperature problems arise that cannot be easily handled. Temperature engineering allows far deeper depths but that appears unnecessary. The key is to pick stable geology and we have plenty of that.