Conan, welcome to the forum. The cockpit rails are all about the same length, span over 5 feet and the midpoint is close to the handles. You can scale up the pictures on the Hobie web site to get very close approximations. The further you can space the racks, the more stable the load. With these things in mind, I suggest your vehicle will be the defining factor in rack spacing, not the boats. You can find a happy medium between centering on the roof and centering over the vehicle to minimize overhang. If you need more exact info, a visit to your local dealer with a tape measure should do the trick.
For garage hanging, I have used the same support system for various boats. You can use wide straps or make crossbars if building your own system. If necessary you've got the cargo rails available also. You will need at least about 4 feet clearance for the Adventure foredeck (your most critical measurement). With this info, one system should be able to handle any of the boats including tandems (except possibly the TI).