Oil catch cans are they needed?

I'm looking at adding this easy mod on my car. from what I understand an oil separator on passenger side is sufficient? Was thinking of going for the Ford Performance one (I like the fact that it's engineered to fit for our cars). Any better options I should know about? Thanks all! I'm new to the Mustang/Shelby world!

thanks Michael for the headsup on JLT will check them out.