Just stand it up at the same location where you will be seating, if it is on a platform or not that does not matter. If you have to move your chair out of the way that is fine. When I did this for my EP600, I just removed the recliner and placed the sub in its place.

M80s VP180 4xM22ow 4xM3ic EP600 2xEP350
AnthemAVM60 Outlaw7700 EmoA500 Epson5040UB FluanceRT85