We have a curved top and very limited roof space on our camper, but we really wanted solar power for the refrigerator and lighting for days we are not driving. We added (2) 100 watt Renogy brand monochrystalline slim line panels, configured in a custom suitcase style, connected with a pair of 30' #10 AWG wires to the controller and bluetooth dongle which were mounted under the kitchen cabinet. We used a "through the wall" fitting which plugs and unplugs for the wires connecting the solar panels to the controller.
Here is a video of the installation:
Here is a video of the installation: