Connecting 2 subwoofers, neither with LFE/RCA-out terminals ?

Is there a reason not to connect 2 subwoofers together but different/separate ways from receiver ?
Subwoofer 1: SW Out on receiver to subwoofer 1 LFE port
Subwoofer 2: speaker level line out from receiver to subwoofer 2 and then to a front speaker ?
Subwoofer 1: SW Out on receiver to subwoofer 1 LFE port
Subwoofer 2: speaker level line out from receiver to subwoofer 2 and then to a front speaker ?
Comments
hope this helps
2 Channel-Denon AVR-4520/SDA 2.3TL's
5.1-Denon AVR-4500h/RT3000P's/CS1000P/RT2000P's/