I've been able to get 3 golf bags in the back trunks laid sideways. The key is to insert one end of the golf bag (club heads) on the left side of the trunk first, and then set the right side down.
The frunk isn't wide or deep enough to handle a golf bag with woods (at least the driver).
If I ever need to get 4 bags in the car - plan is to lower the right side rear seat - and use that are for one or two golf bags - and still have room for 4 adults.
Haven't tried a cart.