I have quite a number of heuchera cultivars but neither of the two shown above so I can't help with identification. Given my druthers, I wouldn't plant perennials in the middle of the growing season unless I had a reliable means of ensuring they stayed consistently hydrated during the warm weather unless they're growing in part shade. I use recycled plastic containers with a pinhole poked an inch from the bottom. I fill the container with water and set it up against the base of the plant. Water comes out the pinhole and gently hydrates the plant. When the water level falls below the pinhole, the remaining water keeps the container from being blown around in the wind. I think of it as the thrifty gardener's irrigation system.

Once the plants are established, I set terra cotta "plant nannies" in the soil close to the base of the plants & upend 1-liter seltzer bottles filled with water into them.