But I was just worried because an SCM-40 is a substantial floorstander to look at my room normally works best with big bookshelves rather than floorstanders
So what I meant is LESS of a problem than other floorstanders, however, you still need to find space for them and for your listening position and you should not sit 3 feet from a three way - my guess is 5 to 6 feet would be a minimum and remember you don't want to be sitting with your head up against a wall - keep 3 feet behind you head of free space (at least).