Meraki warm spare network design

Hi All,

My question is will meraki warm spare work.if i connect isp 1 to wan1 of mx firewall and isp2 to wan2 of second mx firewall.

My requirement is that i dont want to use any switch to divide the dual isp connection to both the switches.

so if i connect isp1 cable to first firewall and wan2 to firewall 2 than will it work.