Please explain what type of plane it is. The answer could vary by type of plane. And the type of plane could vary by the travel date on the same route. And you provided no travel date, no flight number, and didn't even specify whether you're nonstop or connecting, and so we can't guess the plane type reliably.

And btw not every plane type has 6" of extra pitch in every row of MCE.

And in any row you'll presumably have to inflate them after take-off and deflate them before landing, because the foot area must be kept clear during takeoff and landing.