An extra fan?

i have my fans set up like this currently.

and i just installed a scythe kama bay up front.

im thinking about mounting another xigmatek orange fan on the scythe kama bay.

if i mount a fan on it, there'd be around a 13cm space between the "to be mounted" fan at the front of the 5 inch bays and the already existing fan placed at the back edge of the 5 inch bays.

what do you guys think? im concerned if putting two fans consecutively at that distance might result in some airflow inefficiencies.