The drivers are very high on that speaker, those grilles are pretty much for show
I moved the speaker within a fraction of an inch of the couch and I don't find it mucks up the sound too much, but then again those ProAc's are toed in heavily as you can see. The room used to be setup with the couch where the photo was taken (listening spot) and the current listening chair on the left where the couch is (but obviously not as close to the speaker) and I didn't notice any appreciable changes with the furniture move. Not ideal, for sure, but whaddya do in a domestic household!
Now the coffee table (you can just see the edge on the right) DOES muck up the sound bigtime. I move it out when I listen. Part of the routine
I looooooooooooooove tubez. Wish you could see the pre tubes, too.
Notice the well-placed dog. He absorbs first reflection. LOL