There are three options here, depending on where the wind is blowing.
The pilots show two bays to the SW of Carsaig, but the easternmost one is a little less sheltered and usually has moorings. This is my preferred anchorage if there's any south in the wind:
To the north, there is an obvious reef running down the middle of the sound. There is good holding and shelter between the reef and Carsaig Island. There are usually a couple of moorings, but there is still plenty of room. The only drawback to this anchorage is that you are likely to be tide-rode.