What are some effective strategies for defending resource bases with two beaches?

Solution 1:

Given it's been a while I've played this, here's my favourite. I like placing them between both beaches, so the towers from one beach can help the towers on the other beach. I place short range weapons like flame throwers very close to the beaches, and long range towers like sniper towers and cannons further away to help on both fronts. Of course further away from one another that they aren't too easy of a target for barages etc.