Subwoofer placement question digagram included

I guess the usual place for subwoofer is in the corner of the room. For the downfiring subwoofers(specifically Rel Strata III), is it ok to put it where 3 sides will be walls, although one of the wall is very short(14" high). what'll be the difference compared to plain corner? Any reason is it better worth

full length wall
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very short wall (14") || SUB || full legnth wall
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Room |
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