To me, the main thing about coop placement is to put it in a dry area. A wet coop or run can be unhealthy. Locate it where water drains from it, not to it.
I don’t know where you are located, how hot and sunny your days are in summer, or how much shade you get on the south side. Assuming you are north of the equator, the south side is usually not as bad as the west, but if the sun really heats that side of the coop, I suggest not putting your nests there, whether inside or exterior. Heat can be really dangerous for chickens. You don’t want your nests to become ovens. So put them on a cooler shadier side of the coop.
I don’t know what your coop looks like or how your ventilation is set up, but I suggest any ventilation down low also be on the shady side of the coop. If you have ventilation up high and down low, cooler air will come in lower down and warmer air go out of the top. If you put that lower opening in a shady area the air coming in will be cooler so you’ll get better air movement in the summer.
To be honest, unless you are in some really extreme heat location this isn’t that important, except for the part about keeping it dry. That is important. If you have the option, these are little tweaks that can potentially make it a little better but don’t stress over these if it makes it too inconvenient for you. Lots of people don’t take this into consideration and do fine. Modifying your profile to show your general location can help with some of these questions.
Welcome to the forum and the adventure. Glad you found us.