It would help if you said what kind of boat you're looking to install this rubrail on. Rubrails are usually installed as part of the hull-deck join, as Faster mentions, and retrofitting one can range from easy to a real PITA, depending on the design of the hull-deck join in question.
Based on the photo you posted, I am guessing that your boat has either a shoebox or inward flange type hull-deck join, and if you've got decent access to the hull deck join area, then installing an aluminum rubrail might not be too bad.
Faster's concerns about the fastener spacing and size, as well as the profile of the hull-deck surfaces are key. The fact that the aluminum toe rail has a lower flange is probably going to be an issue, since I don't believe it will fit on your boat with that lower flange in the way. Having an L-shaped extrusion would be better and give you a lot more flexibility in the way you place it, including allowing you to have the vertical portion inboard rather than outboard and make bending the toerail easier.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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