Kato 20210 N Scale UniTrack 310mm 12-3/16" Double Crossover
Use two feeder modules. Plan your layout to have a feeder-equipped module on both sides of the crossover, and wire feeders from each track together at the power supplies. For all but the smallest layouts, this is a good strategy anyway.
Equip the crossover module with jumpers. Build it as a double-length module, with straight track at either end. Use terminal joiners to attach jumper wires across the crossover for carrying track power.
Modify your crossover internally. If you are brave, you can open up your crossover and add jumpers inside which will allow you to use the unit on a single without feeder wires or jumpers.
The Kato UniTrack system will help you get your model railroad up and running fast!