As long as these speakers are within, say, ±20-30º of pointing straight at you, you should not notice much variation in tonality or "detail". As to vertical differences, I found they sounded the nicest to me when my listening axis was just below the center of the waveguide, but that's a matter for experimentation.
Just being able to point them away from the side walls should count for a lot as regards clarity and focus of image.
Once you have them set up like this, all you have to do to listen to true Blumlein stereo recordings correctly is move your chair forwards until the speakers are at a ±45º angle from your head instead of the usual ±30º as proscribed for standard stereo listening, including surround when using a center channel. This is a bonus of toed-in speaker arrangements.
With straight-ahead-oriented speakers, 45º off axis is generally too far for quality tonality, due to narrowing dispersion at the top of the bass/mid driver's passband creating a dip off axis in that range of frequencies.
