Mine are Free Standing which can be moved to follow the Sun during the Day.
Van in Shade and Solar Panel on 3 Metre Long Leads.
Works well for me.
120 Watt Panel and only run Fridge/Freezer off 110 AH Battery.
Lights are run off a separate 80AH Battery which is only charged off a DC to DC Charger whilst travelling
Also run a Hot Water System off this Battery