Even with the hot weather we're having, the slips will root quickly. Plant your slips in a hill, your crop will grow vertically right under that slip. I plant my slips about 1' apart. Keep the slips well watered until you see new leaves growing from the slip, then water normally. Sweet potato plants like to ramble, you can plant sweet potatoes in a large pot on a deck, in the fall upturn the pot to harvest the crop. Sweet potatoes take about 90 days to make a crop, longer will make larger tubers. This is a drought tolerant crop but keep them moist for the best results.
I've got an abundance of purple sweet potato slips and I'll take some to the market Saturday. The purple sweet potatoes are starchier, not as sweet, but make great fries, soup, and chips.
Where to plant? It's time to start digging potatoes so dig your potatoes and immediately stick in sweet potatoes.