Im in Utah. The site is nothing but open space with sand on the ground. I didn't check the pear :((( before buying it :(((. ANd Im planning to let the grapes go along the fence. Thank you for your input

Do you have views you want to preserve out toward the open space? A need for a privacy screen? Or sun screen from the hot western sun? Placing trees is a long-term commitment. It is important for you to know the mature size of the trees so they don't grow to hang over the house, obscure windows, or lift concrete walks or patios -- not that we know you have any... I'm no help because I have not grown the plants on your list, but those are some of the considerations you'll want to think about before planting. Posting a few photos can answer lots of questions for those who would like to help you.

Also, at least 10' from the neighboring properties so the fruit isn't dropping and rotting. If you want the grape vines for fruit rather than just a vine to cover the fence, the fence should be wire, where sun can hit the entire vine both sides...no shade at all, and the vine can be pruned annually. It's best if your grape vine runs north/south rather than east/west.

Really need to see photos of the site. It is very difficult to make any sort of meaningful suggestions for placement without a clear visual sense of the site. Fruit trees are not usually large and most are available on dwarfing root stock so concerns about their placement is usually far less critical than larger growing shade or ornamental trees. You should be able to easily place the trees along the 70' width - if you get a second pear, I would flank them on either side of the much smaller growing peach. The currents are relatively modestly sized shrubs so they can fit in anywhere. Just make sure everyone has sufficient space to develop to maturity and they all receive plenty of sun.

And if growing along a wooden fence or on a dedicated trellising system, the north-south orientation for the grapes is the best.

I would start with a component list of exactly what you need in your yard. Once that is done hire a professional outdoor living landscape designer create a plan for the entire property. You can piece together the landscaping over time. Small spaces need more attention and design skills than larger spaces because you can have multiple uses for your areas.