I remember reading somewhere on the 'cult IB' site that it’s recommended that you do the sub crawl using a box sub to find a preferable location. Still, IB location is somewhat less critical than a sub box because of the xover setting is usually much lower than a box. However , I’ve seen a lot on the IB site, that you do need to worry about wave cancellation , which sometimes is related to location & wave reflection.

The sailor does not pray for wind, he learns to sail. --Lindborg