moving 150lb speakers each time will not be fun and yes Wilson are more particular about placement then your current aerials or other typical speakers. Wilson speakers head designs and defraction panels are designed to prevent side wall interactions (aka like a monitor) so they don't throw as diffuse of a soundstage as most speakers do. Wilson Sophia's are more forgiving but WP's aren't.
I was in your situation and bought Magnepan's first(Get some 3.6's) and you can pull those out and put them up against the wall very easily.
If you have tile or wood floors and insist on the Sophia's get some Sound Anchor Cone Coasters (Stainless steel spike cups with a teflon pad that won't damage your floor and are large enough to cross tile gaps without letting the spike slip out). Get a T square or mount string on the wall so you can get the exact distance for the front left and right spikes. This would be a quick way to get that exact position. I use method with my Wilson Maxx II's and my WP7's before them when changing gear or cleaning. Leaving the Wilsons on the wheels doesn't sound good
I was in your situation and bought Magnepan's first(Get some 3.6's) and you can pull those out and put them up against the wall very easily.
If you have tile or wood floors and insist on the Sophia's get some Sound Anchor Cone Coasters (Stainless steel spike cups with a teflon pad that won't damage your floor and are large enough to cross tile gaps without letting the spike slip out). Get a T square or mount string on the wall so you can get the exact distance for the front left and right spikes. This would be a quick way to get that exact position. I use method with my Wilson Maxx II's and my WP7's before them when changing gear or cleaning. Leaving the Wilsons on the wheels doesn't sound good