mkgus, a DSP designed for bass management will work fine. The subs can be placed anywhere in the room. I think against a wall or in a corner is best as this placement increases efficiency. I would put the two front subs in the front corners and the others anywhere. Ideally if your crossover is low enough a mono bass channel is optimal. With a swarm system I think it behooves you to use a cross over below 80 Hz and as Duke suggests use a steep curve, 24 db/octave or higher. If you are using a DSP bass management system I have seen crossovers as steep as 80 dB per octave which I actually think is too steep. The speakers do not blend well. 48 dB/oct is the steepest I would use. If you put them all along the front wall they may actually overwhelm your speakers. It is always OK to experiment. Just leave yourself extra wire until you are sure of the placement.
