Airflow comes DOWN the return air main TOWARDS the furnace. ....so arrow towards the furnace.
Some filters don't have the airflow Indicator but a protective wire or cardboard mesh on one side . That mesh or wire is to protect the motor and fan blades from drawing in the actual filter media.
Lastly. Using ANY filter higher than a Merv 6 is insanity. The stress you are putting on your motors (inducer, ECM, and dc )! , temperature sensitive components and coils and Condensate production increases 18-30% over all which increases your gas and electricity costs by that much because it's taking thay much longer to heat or cool your house.
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