On my previous van I had cables from the top of the panel into a dual entry gland. They faced the direction travel, never had an issue with water coming in. Cables were relatively taught and the glands were fairly close to the panel. There was no slack in the wires that could get caught.
This time I’ve gone for a panel with the connections on the underside. There is a slight bulge in the panel where the cable box is underneath but it’s much neater. The panel then covers where the wires enter the roof.
I’ve also seen panels where the cables exit the top of the panel and are then tucked underneath the panel (in the gap created by the ribs on the roof) then the panel stuck over the top covering where the cables enter the van.
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