I'm not sure where my son mounted the lights but I think he put them below the folding point on the ROPS. I told him I wanted to be able to use the lights even if the ROPs is folded. You could drill a small hole on the inside of your ROPS and run the wiring on the inside. This would make for a clean install and also protect the wires.
"Always do your best. What you plant now, you will harvest later."