Yes, maybe you can get acceptable sound...and in some cases maybe even good sound with open baffles at 2 feet....But....I don't think you can apply a universal rule when it comes to open baffle location and best sound because of how much room influence there is.
When I owned the Spatial Audio M3 Sapphires, I started at 30"....then 40" then 50"...and in my room, ended up at 41" as the "best sounding" location.
I tried the same with the Magnepan LRS+..and ultimately ended up with 60".