Your rails on the upper deck are at least long enough to hang a pair of 100w panels on each side. You can prop them securely over the side decks, (so no useable space is affected) to have them fully exposed to the sun. I fold my bimini back when it gets cool on the upper deck, as the wind whistles through if I don't. I also need to collapse the bimini to go into my shelter, so a bimini mount doesn't work for me.
Pictures of mine are in the installation thread, around a year ago.
I have a pair of 160w panels so mounted. I have just returned from a month away, mostly at anchor. I run a fridge and a separate freezer. I needed my genset only for hot water on days that the main engines were quiet.
You can too.