I can’t confirm the dimensions but would say that yes over time it will bow the question is over what amount of time. One way mitigate this might be to flip it over periodically. I don’t think it would matter which side is up so if you flipped it ever month or so it might not be an issue.

If there’s something for it to rest on at the ends what’s preventing you from running a support across and under the speaker?

3M80 2M22 6QS8 2M2 1EP500 Sony BDP-S590 Panny-7000 Onkyo-3007 Carada-134 Xbox Buttkicker AS-EQ1