Nothing particularly cost-friendly for hauling 5 bikes.Why the need to move so many at a time?
What sort of 'sedan' that covers everything from a Toyota Corolla to a Lincoln TownCar. Also, what kind of bikes? 18-lb carbon road racers? 50 lb. beach cruisers? 16" kids bikes? Fatbikes? Frankly, 5 bikes (and riders?) is going to be a big ask of most any passenger car from the last ten years (except maybe a P71 Crown Vic)
If you haul 1-2 bikes frequently, but sometimes have to haul 4-5 (races or big events) then you could have a 2-bike hitch/trunk rack that you use for the 'daily riders' and a 2-4 bike 'XL' roof rack that you slap on for big events. You could also do it the other way, Leave the 2-3 bike rails on the roof full-time and slap on a trunk rack like a Saris, when you gotta haul some extra bikes.
A lot of people balk at the idea of removing and re-installing a roof rack, but once you get the initial setup done, all you have to do is unhook the towers from the car, and take the thing off in one piece. You don't have to completely disassemble the thing every time.
Same goes for strap-mount trunk racks; once you get your rack set up for your specific car, just loosen the straps enough to unhook them, leave the 'arms' as they are, and it doesn't take much to hook it back on again.