Need need need. If it’s that important to you, you should have invested in a redundant option long ago. Time to mooch off a neighbor or camp out at a coffee shop or find a temporary office.

I’ll take a different slant than most others here. Daisy chain the switches. I trust a switch’s ability to switch packets closer to line rate more than I’d trust a router’s ability to do so. I’d rather keep the switch to switch traffic on two devices rather than force it through a third. Obviously use the fastest ports on the switches for the switch to switch link.

But definitely not two cables from switch to router, and unless you can build a LACP LAG between the switches definitely not two cables switch to switch.