Having the two leadouts as close together as possible can be a good idea. But keep in mind that your line connectors are going to hang up on each other given the chance. And if the leadouts are the same length, they'll have the chance from the git go. And the closer the leadouts are to each other the more chance they'll have.

So if you're new to this, it's a good idea to have the leadouts close to each other, but if you do, then make your leadouts sufficiently different lengths to solve the connector fouling problem. Have you ever noticed how long the adjustment is on most guy's handles is? That's to make up for the different length leadouts on their airplanes. There won't be connector fouling at your handle, but there will be at the airplane. So the handles are made to deal with what happens at the airplane.

Lots of little details matter.