Most pool solar heating systems on the market are glorified black air mattress-like water bags that are plumbed directly to your existing pool plumbing. Basically, the sun heats the water filled bags (usually 4'x20' or similar size). For your pool size, one water bag should be enough.
You can lay them down anywhere but if they're going to be mounted on the roof you'll need the extra piping and pump power to pump water up to the height of the roof.
Keeping in mind that there are many different brands available, expect to pay about $600 for the water bag. If extra piping is required plus the professionals to plumb the heater into your existing system then you will be paying more for materials and labour (maybe $1000 more depending on how evil the installation is).
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