You can get them either way. Phill Dill boats down in Texas had some OEM covers for an Epic 22, not sure if they still have them or if they were tower up or tower down. You can get a regular cover modded for tower for pretty cheap, 100$ or so. I'd call them first, the factory covers are nice. I think they are around $600, phill dill was blowing them out for 150$ or something.
If you want to go nuts, I'd get a Rankin. You can call them, they have the pattern for that boat. They are a cover that attaches around the rub rail, no straps, except in back. They don't need sticks to not pool water, they are trailerable, etc. I think they cost around 900$.
I'm getting a Rankin with my new (to me) SX:

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