Not the most elegant solution, but works well. Remember that solar panels need an air gap to stay cool to work efficiently. A regular grommet is mounted under the panels and through the roof and sealed off with sicaflex, had never leaked.
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A friend of mine glued flexible panels (sailing boat type) to his westfalia bus (slightly slanted forwards on his alcove top) and had to replace them twice. The third time a solar panel expert told him that the flexible panels can't cope with the pressure of driving wind... no idea if it's true, just putting it out there.
Do the cables go through the roof top?
I had planned on mounting the panels on some corrugated plastic sheet, but wondered about if it may degrade too fast in the hot Middle Eastern sun.