My suggestion would be to add cardboard or something up the sides to hold water. My garden did SO WELL, but it dried out easily. Also, in the individual holes, I planted herbs, green peppers and zucchini. They did excellent also!
Build a pyramid planter for your strawberries. Each hole in the concrete block will hold more than enough soil for a strawberry plant. Wooden pyramid options I've seen waste too much soil under unused space. Once the plants grow in.