If you're looking for a meeting place or a good stop around ½ or halfway between Camaiore and Basel, you can try Varese, Italy, which is about 3½ hours northwest of Camaiore, or about 3 hours southeast of Basel.
Other possible places to stop near the midpoint include Busto Arsizio, and Como.
About ¼ or a fourth of the way, you can stop at Parma, Italy. This is about 1½ hours north of Camaiore.
About ⅓ or a third of the way, you can stop at Piacenza, Italy. This is about 2 hours north of Camaiore.
About ⅔ or two thirds of the way, you can stop at Biasca, Switzerland. This is a little over 4 hours north of Camaiore, or about 2½ hours southeast of Basel.
About ¾ or three fourths of the way, you can stop at Schwyz, Switzerland. This is about 5 hours north of Camaiore, or about 1½ hours southeast of Basel.
If you drive straight through without stopping at all, the total distance is 605 km. The distances shown above don't include local roads to get into each town, so if you're planning a long road trip, make sure you factor in traffic and road conditions, rest stop breaks, and interesting detours along the way. If you're in a rush, you can do the trip with zero stops, and your total travel time would be around 6 hours, 38 minutes.