I’ve only heard them at length in my own room, which is 7 metres long by 3.5 metre wide. I sit about halfway back (down the length) and about 2.6 metres away, the speakers being about 80cm from the front wall, measured from the front of the speakers.
The demo room I auditioned them in was probably about 5 metres long. However, I have a friend with some, and his listens across a room and sits barely 2 metres away - and they’re fine.
Being sealed boxes, like your SCM7, they can tolerate pretty close proximity to the front wall, though you’d not want them crammed into a corner - not great for any speaker. The manual for yours probably contains the same advice for all the Entry series.
How much space do you have?