Quick answer
What to do first
Split the base into entry, middle, and cleanup coverage. Record the first breach, then change only that layer before the next run.
There is no universal coordinate map for build a base rng best base layout. Build a base RNG asks you to roll objects, place them, and defend the base, so a useful layout depends on what your current roll can cover. Put a path-shaping or front-line option at the entry, protect a middle coverage role, and reserve a cleanup position near enough to catch survivors. Run the same wave once, note the first leak, and change one position only. That controlled test shows whether placement helped without pretending that unpublished range or damage values are known.