The SSD will run much cooler, so you can just tape in the same spot as the old hard drive and you should be fine. The reason you wouldn’t want to just let it ha

The SSD will run much cooler, so you can just tape in the same spot as the old hard drive and you should be fine. The reason you wouldn’t want to just let it hang someplace would be that it could end up getting hotter than the hard drive actually is, so the firmware on the motherboard might throttle stuff to prevent overheating. So the spot on the end of the HD is probably a spot where the air flow is reasonable so it won’t get overly hot there and represents the actually HD temp.