I can attest that Speedify in redundant mode will handle a link failure in the middle of a Zoom call without a single lost packet or other impact. This isn't failover, though, this is redundancy; it's like having a 1 disk fail in a RAID1.

(I have a similar setup to the OP, but using an array of M.2 4G/5G modem cards connected to external antennas.)