thosb - vertical lobing is a central draw-back from first order crossovers. Your ear must be at the right height to receive proper integration. The closer to the speaker, the more critical is the correct spot. Target design was 35" at greater than 8'. (I heard that 35" migrated to 36".) My studio doesn't have a couch or living room seating and the lowest setting for my adjustable chairs gives 42". My solution uses a drywall square - a big aluminum T. I clamp it to an inside speaker face with the long arm centerline at 36" off the floor and tilt the speaker until I am sighting straight down the square's long arm. Vertical tilt is much more important than toe-in due to the vertical arrangement of multiple sound sources. Coaxes are more forgiving than individual drivers, but still interact with the woofer.
FYI: part of the mechanical upgrade is a threaded front spike for easy tilt adjustment.
FYI: part of the mechanical upgrade is a threaded front spike for easy tilt adjustment.