If you're looking for a meeting place or a good stop around ½ or halfway between Ganja and Tsnori, you can try Gardabani, Georgia, which is a little over 2 hours northwest of Ganja, or about 2 hours west of Tsnori.
About ¼ or a fourth of the way, you can stop at Tovuz, Azerbaijan. This is about 1 hour northwest of Ganja.
About ⅓ or a third of the way, you can stop at Gazakh, Azerbaijan. This is about 1½ hours northwest of Ganja.
About ⅔ or two thirds of the way, you can stop at Didi Lilo, Georgia. This is about 3 hours northwest of Ganja, or about 1½ hours west of Tsnori.
About ¾ or three fourths of the way, you can stop at Sagarejo, Georgia. This is a little over 3 hours northwest of Ganja, or about 1 hour west of Tsnori.
If you drive straight through without stopping at all, the total distance is 295 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 4 hours, 24 minutes.