Where should I place rear surrounds in this toddler friendly setup?

Recently gotten into the home theater game trying to balance sound with toddler friendly placement.

I have:

• KEF q150 fronts on the upper shelves (I know they’re too high but kids can’t get em this way)
• KEF q250c center in the media console
• RSL Speedwoofer 10e on the floor

I want to try and get bookshelf surrounds but not sure where to place the rear left. I have a shelf over top I could place 1 but then there’s an open space behind me as pictured.