I came back from Senegal/Mauretania/West-Sahara/Marroco and I had one exceptional positive experience concerning camp sites: This Boujdour, between Laayoune und Dhakla, approx. 150km south of Laayoune. The camp site is really new, very clean and the best sanitary arrangements, hot water. For me just perfect. Here the GPS-data: N26 07.941 W14 29.676;
from the main road in the middle of town you find a sign "camping" direction to the sea. I also can recommend breakfast there. The owners were incredible nice.
Have a nice trip.