If you fill tanks then I suggest to rig the filter so it's above the compressor. I have my non GX filter rigged on a stand so the GX hose runs up to the filter inlet to promote any condensate to drain back to the compressor's water trap. I feel that it limits the amount of moisture that goes into the filter. Then tank is above the filter outlet.
For gun fills I think sticking the filter on the compressor is probably fine, but note GX's recommendation to not put the magnets next to the power supplies (for the CS3-I and CS4-I).