The Maj7#5 chord works great over altered chords. For example, play the (Ab)Maj7#5 over the 3rd of an E7Alt to outline all the juice notes of the chord (particularly The #5, #9)
Here are a couple diagrams.
first one is the AbMaj7#5 hexatonic
Second one is the same scale but with Analysis over E so you can see the alterations
