Flordaprince can fruit alone, but it still benefits from a partner. Most peaches and nectarines can fruit alone, but a second compatible tree often improves fruit set and reliability. It flowers in early bloom, which is worth knowing if you add a second tree later. Usually grown in USDA zones 8-10.
No single variety stands out as the obvious partner, but that is not a problem here: Belle of Georgia, Contender, Elberta, Halehaven, and July Elberta all bloom close enough to work. There are 6 more in the list below. Pick whichever your nursery actually carries. If you plant two peaches, keep them close enough for bees to move easily between them. A second peach within about 50 feet is usually plenty in a home garden.
One thing to keep in mind. Chill note: Low chill, around 150 chill hours.
To put that into practice: at a minimum, one self-fertile peach is enough to get fruit in most home gardens. Better still, plant two peaches or a peach plus a nectarine with overlapping bloom to improve fruit set, fruit size, and spring backup. If you have one self-fertile peach already, add another peach only if you want heavier crops or better odds after erratic spring weather.