Transit Duo Wan bonding an hot failover

Hi all,

I have a transit duo on SFC, 2 questions.
Q1 Is it ok to bond different wans in priority 1 or should only use sim wan?
currently I bond sim, wifi and wired.

Q 2 Hot Failover - How to best set it up. If I have a wired wan in priority 1 and sim/wifi in priority 2 my understanding if Priority 1 fails it should switch to Priority 2 wans?

Thanks in advance