Not sure that those Bass Traps will do a whole lot in the Bass region, but they will be useful for killing corner flutter and it may be good to put them floor to ceiling in all three "corners" in your room. Always a good idea to treat the primary and secondary reflection points on your side walls ceiling and floor with some quality absorption (check out the art based absorbers at acoustimac :-)) . Then also treat the primary reflection points behind the speakers with diffusion (the skylines are good for this purpose). Those things alone will make a BIG difference in your listening experience. Then you can fine tune the bass region using membrane based bass traps, but you'll need some good measurements to select the right frequency tuning and placement. I also like to use "flags" to stop additional high frequency bouncing along ceiling / wall interfaces. Those can be made cheaply using small high density panels from Burton Acoustix. Just cut them in half (diagonally) and attach to the ceiling wall interface (perpendicular to the wall) every 2-3 feet using those 3M adhesive strips that can be removed without damaging the wall or paint. Surprisingly, I've also found the Burton Acoustix panels (only about 0.4 inches thick) to be very useful for primary and secondary reflection points. Not sure how these thin panels work, but they really do - inexpensive too!
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