The shelf is likely to produce a strong resonant frequency in the audio range, with minimal damping from the brackets/support. Loading it up with books will help but I would try to isolate speakers from the wood if possible. Speaker quality can’t compensate for physical effects!
Of course it will be basically fine for listening whatever you do but if you’re spending big money there are gains to be had for minimal effort.
Brick wall behind, shelves that float on the metal side supports, no sides to the shelves, and isoacoustic stands / pucks under them. It's going to be fine.
The shelf is likely to produce a strong resonant frequency in the audio range, with minimal damping from the brackets/support. Loading it up with books will help but I would try to isolate speakers from the wood if possible. Speaker quality can’t compensate for physical effects!
Of course it will be basically fine for listening whatever you do but if you’re spending big money there are gains to be had for minimal effort.