i have the shl5+ in a similar front half of the room configuration and they work really well.
you should be file with a minimum 24" rear baffle to wall which puts the front baffle 8 feet perpendicular to your listening spot. if you position in an equilateral triangle then the speakers will be 11+ ft from your spot which would be excellent- they like to be listened semi nearfield.
i also owned the C7ES3 and rave about them too. I do not care as much for the 30.1 or 30.2, they have a noticeably smaller sound. The 40’s would definitely be too large for your listening area.
you should be file with a minimum 24" rear baffle to wall which puts the front baffle 8 feet perpendicular to your listening spot. if you position in an equilateral triangle then the speakers will be 11+ ft from your spot which would be excellent- they like to be listened semi nearfield.
i also owned the C7ES3 and rave about them too. I do not care as much for the 30.1 or 30.2, they have a noticeably smaller sound. The 40’s would definitely be too large for your listening area.