Zucchini has always been feast or famine in my gardens. I've planted 6 hills and harvested no fruit and I've planted one hill and had more than I could give away and everything in between the 2 extremes. They are also elusive little devils, you can swear you've looked under every leaf, everyday and still find one two feet long and 6 inches in diameter.
If you have no polinators, go with a zucc that doesn't need a polinator the most popular one I know is called Perfect Pick, you get them with out polination. Cheaper than getting bees. Trust me about this.