I just helped a friend install 400 watts of solar panels
on his trawler
. 400 watts will be a lot of area to fit on a sailboat. The best place is to install them on top of your bimini
as you suggested. Go to a canvas
shop and ask them to make stainless hoops that will go from the bimini support struts up and over the top of the bimini. Attach them with plastic rail clamps.
But you will need at least 6-10" of vertical clearance between the bimini and boom to so this. Most boats don't have this much clearance and getting more isn't easy.
You will be lucky to get 120 watts of panels
on each side of the boom. But that will let you use 17 V panels
. These can be used with a non MPPT
lower cost controller and IMO at 240 watts the cost of the more sophisticated controller isn't worth it.
There are dozens, maybe hundreds of solar panel sites. Try altestore.com or wholesalesolar.com. Hook up your two panels in parallel and feed them to the controller with 10 gauge wire. You will need at least a 20 amp controller for 240 watts. Morningstar, Bluesky and others make them.