We did this with a similar sized area last year. We only had butternuts, so planted 4 in wioth the sweetcorn. One was almost decimated by slugs and one just never did much, but two went mad!!! They did spread loads, but we didn't pinch them out until really late. We had a total of 12 squashes, the smallest of which put shop bought ones to shame! Most were huge, we've just eaten the last one!
This year I have loads of different types to try!!! We've got the squash bug!!!