If you're happy with PVC enclosures* these look like a great choice to me, with the improved support of a metal frame. Don't know anyone who's tried them though?
(*Full disclosure, I'm a glass fan, tried a pair of Proline HDPE plastic enclosures a while back, still prefer glass & my Prolines were "rehomed".)
On these, you could probably add a center cross-bar for added support pretty easily...just go to Home Depot/Lowe's (etc), make sure to measure accurately, & glue
it underneath.
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