I've been around subwoofers since M&K first introduced them in mid-70s. I've used them with lots of speakers, large and small including Magnepans and KEF LS-50s, both notoriously difficult to get 'right' with subs. Two major success criteria:
1) the HP and LP filter should must be used, and set as low as possible. Typically no higher than 60Hz for music, and 80 Hz for Home Theater. The HP keeps the low bass out of the mains, improving their dynamics and power handling, by reducing their low bass load. OThis means no speaker-level connection - your preamp needs a Sub Out with bass management, or the sub itself needs line level inputs and HP line level outputs back to your power amp. The latter usually limits placement options, however.
2) Placement and level settings will take some effort. However, same wall as your main speakers, roughly 25-40% of the way across the wall is a good starting point.
Listen to both male and female vocals first to make sure the sub isn't adding mud or chestiness, then to material with true bass, (Beyond The Missouri Sky, Pat Metheny & Charlie Haden) then sub-bass (I Believe When I Fall In Love, Stevie Wonder). Most people have never heard the pitch, tone, and texture of Charlie Haden's bass done properly or the sub-bass synth line that underpins that Stevie Wonder cut. A good sub, well placed will reveal what's actually on those cuts.
Either the T/5 (or T/7) or the Micro 3000 are excellent choices for your system. The KC62 I would recommend if you had LS-50s.