With a 36-inch fan and commensurate duct, I could probably move 10,000 CFM. At that flow rate the details of hood aperture overlap for best capture and containment would fade into insignificance.

>> Just kidding, alimages, I realize that you meant 36-inch hood with internal fan. <<

However, while the Broan Evolution model QP436SS may have enough flow rate for its fairly shallow 20-inch depth, (aperture is even smaller), it is desirable in general to have more front-to-back depth to help capture the expanding effluent from the front burners. You could, of course, limit cooking the worst grease and odor offenders to the rear burners.

360 CFM is too small for even that size of hood, although the claimed actual flow of 630 CFM (assuming your meshes are clean) of the QP436SS is likely adequate. (You will not achieve that flow rate unless the hood is hanging in the air outside. You may get close with adequate make-up air (MUA), such as Broan alludes to at their link.)

kas