Overview
Currently, there are no checks for a turret that can outrange spitters, making it possible for the only way to defend one's base to be landmines or frequent offense. (Worms aren't an issue; it's fine for them to outrange things).
Action Items
The best way would probably be to apply a fix post-randomization.
randomizations/fixes.lua that tests for enemy units that can outrange all turrets and decreases their attack range to just below range of the turret with the largest rangeExtra Considerations
Allow spitters to outrange everything might be a valid setting/thing that happens on higher chaos. It might also be good to consider adding code to make sure a turret outranging them comes sufficiently early in the game, but that could also be overcomplicated/overkill.