This would be far better than the manfrotto 293 product you are considering.

https://www.amazon.com/Neewer-Aluminum-Baseplate-Release-Mattebox/dp/B00VV6QCZE/ref=sr_1_12?ie=UTF8&qid=1505791640&sr=8-12&keywords=camera+rail

$40 and it will support your lens. If you want to add a matte box you could probably find a kit a little more expensive with that too.