It takes a lot of time and you just have to be a bit dictatorial when herding cats, especially if eleven people on seven bikes like I had a few years ago . This year, I could not find anywhere south of Munich around Tegernsee so I simply announced we would go into Austria and stay at Bregenz on Lake Constance instead. It means we won't go further east than Oberammergau on the German Alpenstrasse but we will ride in the Hahntenjoch instead.
Sometimes, especially for a single stopover, you take the easy option and book a city centre Ibis or other chain hotel. At least then, being in a city centre, you should have a choice of places to eat & drink. Hence this year, we will assemble at the Campanile Reims Centre Cathedrale before heading to an independent hotel in Obernai, Alsace for a few nights.