Take the panel off and mount with either a backing plate or even easier use bolts with large washers. You don't want some loose cargo hanging up on it and one of those screws pull out or worse crack the panel.
I'd use some large washers to distribute the load. IMO.
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2011 Stone White Grand Cherokee Laredo E, ORA1, QT2, Factory Trailer Tow, 3m FX 15% Tint.
1998 Wrangler Sahara 10inch skyjacker lift, 38x14.50 TSL
2005 Grand Cherokee Limited, 5.7, QD2