Swapping 3 rooks in a 3x3 grid

Question

This puzzle was inspired by this one: Swapping rooks in a 4x4 board
What is the least number of moves required to swap black and white rooks? Rooks move using standard chess rules - any number of empty cells vertically or horizontally. You do not need to alternate players.

Alaiko · Accepted Answer

Using the same notation that @Deepthinker came up with, (i.e. x = black rook, o = white rook, - = empty space), I came up with the following series of steps:
Starting Position: 
x x - 
x - o 
- o o 
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I do not know whether or not this is the optimal strategy though. Still working on that.

Swapping 3 rooks in a 3x3 grid

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