I have recently purchased a set of BS over and above my existing FS and am retaining both. But my problem is that a full fledged stand would take up additional floor area which i do not have presently which you can easily see from the picture given and it is not possible to shift the sub further right or else it will become an obstacle in the corridor adjacent. So my question is if there are any negative sides of keeping the bs on top of the Fs like in picture. Of course another option i have is to get a custom built wooden stand that occupies lesser floor area but has a bigger top to accommodate the BS comfortably