You don't need a second basking spot, but you do need to make sure they each have hides on the warms side and hides on the cool side.
If you are planning on getting a male, you might do better to introduce him after the female has established a territory in the new tank. Having a male intorduced can be stressful for female, so it would be better to allow her to establish a territory so she has more confidence around him. Remember, if together, the will breed, so be prepared if you introduce a boy. If you get a female, introduce them into the tank at the same time. I've never had a problem introducing leopard geckos, but theres always a chance that females can be territorial towards other females. Also, make sure the two are roughly the same size, or one might lose toes or a tail.
I've always fed my four geckos together. They have one mealworm bowl thats always full, and they just take turns and eat whenever they want. There are rarely food scuffles, even when I throw in crickets. However, the most important thing it to remember to watch them. If one is not eating, put in a second food dish, on the other side of the tank. One gecko prolly can't chase another away from two food sources.
But also, make sure that you quarantine any new animals and/or take them to a vet. It can take weeks for a parasite to be noticable, and by then it will have spread.
Good Luck!
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Corn Snakes: Eden, Mars, Sierra, Lavendar, The Tweedle Twins
Crested Geckos: Parker, Emily Dickinson, Bonnie, Benz, Jude, Cali
Leopard Geckos: Paris, Helen, Annabelle, Artemis, Vesta
Jambea Dwarf Retic: Montague
