Here's my idea for tilted pairs of panels.
The pairs should be spaced apart enough that they don't shade each other until angle of sun is at least 45 degrees past orthogonal to panel.
If pair has 90 degree angle to each other (45 degrees to roof) that distance would be infinity so a compromise.
90 degree angle gives peak power 0.7x what both flat would be. More flat would be closer to 1.0x
60 degree angle would have peak 0.5x or same as a single panel (I'm considering that for truck roof rack, single tilted pair rather than multiple which would shade each other)
In my area, panels under 18" high (and under 40# per mounting point) don't require structural permit.
That is enough height to allow a decent tilt. One low-profile rail and one high-profile could hold a column of panels on roof.
It won't give you more watts at any hour of the day than overpaneling with a completely covered roof. With panels sufficient to cover 50% of the roof, it might give a broad, lower peak that fits feed-in or battery charging limits. Also recharges battery sooner, keeps it full later.