I am just thinking in my very small room with speakers facing the short side (~1.5m wall to sold wood cupboard), the integration of the sub will be damned difficult if not impossible, very likely just will get overwhelmed by sub bass for the sake of chest slam and throw off the neutral balance where we buy these Genelecs for??
Proper integration goes a long way with subs. If you time/phase align them, then EQ the resulting overall response in a nice slope, you'll get lower distortion from crossing over the 8030's higher, and thus, better midrange, IME. I've been comparing the 8030's to my little Dynaudio Emit 10's, and thus far, the 8030s seem to do well in producing a less euphoric, and more neutral sound.
I used the bass roll off switch to provide a gentle LF slope on the 8030, and cross in a pair of small, sealed 10" subs around 120Hz. The 8030's sit atop stands which sit on top of the subs, and the sound is very good. This is the easiest part of the integration of course, but it yields positive results fairly quickly. I then run EQ APO/Peace and dip 53Hz for a room mode, then bump 2.5kHz up by about 2dB. I sit nearfield, so there isn't too much by way of reflections, though the wall behind me is heavily treated.
Best of all, those Gennie's will play even louder, without distortion now. Of course, this is just for music down to about 30Hz.