The MX67C/MX68CW contains a 3G/4G modem which can be used for cellular failover (3rd WAN interface-ish).
Otherwise, no. All MX'es support only 2 WAN interfaces.
MX250 and up, have two dedicated ports. MX100 and below, has one dedicated port, and one shared, which can be converted.
					
				
			
			
				
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