May I ask what are your room dimensions (HxWxD, including openings to other areas)? Where are you sitting relative to front/side/back walls and openings?
The VTF-3 MK3 in the nearfield should work quite well. The only general guidelines are to give at least 2" of space between the side-firing driver and anything it fires into, and at least 3-4" of space between the rear-firing ports and anything they fire into.
Pete - Hsu Research