Quantums are mostly diy and in kit form . Some kits come with everything , simple to wire and use.
L shaped or channel shape extruded aluminum can be bought at any hardware store for some building ( suited for your own design or space )
You can see I just cut a small piece of L shaped aluminum ( to fasten to QB 96 ) then a little L bracket to channel shaped aluminum.
Easy.
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But as he stated above the 3 QB 288 R spec board kit is hard to beat ... simple screw to heatsink and wiring .
Driver 320w is about $82 ( different vendor ) and your done.
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But any of their offerings work well .